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Стандарты кодирования PHP (PSR)

Лекция



Привет, сегодня поговорим про стандарты кодирования php psr , обещаю рассказать все что знаю. Для того чтобы лучше понимать что такое стандарты кодирования php psr , настоятельно рекомендую прочитать все из категории Разработка программного обеспечения и информационных систем.

PSR-0: требования к названиям классов

и неймспейсов для универсального автозагрузчика.
Полное имя класса должно быть вида `\<Vendor Name>\(<Namespace>\)*<Class Name>`

 
`\Symfony\Core\Request` => `/path/to/project/lib/vendor/Symfony/Core/Request.php`
`\Zend\Acl` => `/path/to/project/lib/vendor/Zend/Acl.php`
`\namespace\package_name\Class_Name` => `/path/to/project/lib/vendor/namespace/package_name/Class/Name.php`
 



PSR-1: Основные стандарты кодирования

Секция описывает общие правила оформления кода:

- Использование только тэгов <?php и <?=
- Только UTF-8 без BOM для пхп кода
- Не стоит мешать разный функционал в одном файле
- NS и классы должны следовать psr-0
- классы объявляются в `StudlyCase`
- методы объявляются в lower `camelCase`
- константы объявляются в ТАКОМ_ВИДЕ

К свойствам класса не предъявляется требований, они могут объявляться в любом виде,
важно чтобы стиль был однотипным для всего проекта.

PSR-2: Стандарты оформления кода

Собственно представляет собой требования к оформлению кода:

- код должен пользовать 4 пробела вместо ТАБ для отделения кода

- длина строки не более 80 символов, ну 120 в крайнем случае

- пустая строка после объявления NS и USE блока

- открывающая скобка `{` объявления класса и методов должна находится на следующей строке, а закрывающая `}` на следующей строке после кода 

- для всех свойств и методов обязательно указывать видимость;
ключевые слова `abstract` и `final` указываются до объявления видимости, а `static` после

- После управляющих ключевых слов (команд языка) должен ставиться пробел, не ставится после вызова методов и функций

- Открывающие скобки `{` для команд ставятся на одной строке с ключевым словом, а закрывающая `}` на следующей строке после кода

- Скобки команд `()` не должны начинаться и заканчиваться пробелами


Пример оформления:

 
 
<?php
namespace Vendor\Package;
 
use FooInterface;
use BarClass as Bar;
use OtherVendor\OtherPackage\BazClass;
 
class Foo extends Bar implements FooInterface
{
    public function sampleFunction($a, $b = null)
    {
        if ($a === $b) {
            bar();
        } elseif ($a > $b) {
            $foo->bar($arg1);
        } else {
            BazClass::bar($arg2, $arg3);
        }
    }
 
    final public static function bar()
    {
        // method body
    }
}
 
 
PSR-3-logger-interface.md

Logger Interface

This document describes a common interface for logging libraries.

The main goal is to allow libraries to receive a Psr\Log\LoggerInterface object and write logs to it in a simple and universal way. Frameworks and CMSs that have custom needs MAY extend the interface for their own purpose, but SHOULD remain compatible with this document. This ensures that the third-party libraries an application uses can write to the centralized application logs.

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.

The word implementor in this document is to be interpreted as someone implementing the LoggerInterface in a log-related library or framework. Users of loggers are referred to as user.

1. Specification

1.1 Basics

  • The LoggerInterface exposes eight methods to write logs to the eight RFC 5424 levels (debug, info, notice, warning, error, critical, alert, emergency).

  • A ninth method, log, accepts a log level as first argument. Calling this method with one of the log level constants MUST have the same result as calling the level-specific method. Calling this method with a level not defined by this specification MUST throw a Psr\Log\InvalidArgumentException if the implementation does not know about the level. Users SHOULD NOT use a custom level without knowing for sure the current implementation supports it.

1.2 Message

  • Every method accepts a string as the message, or an object with a __toString() method. Implementors MAY have special handling for the passed objects. If that is not the case, implementors MUST cast it to a string.

  • The message MAY contain placeholders which implementors MAY replace with values from the context array.

    Placeholder names MUST correspond to keys in the context array.

    Placeholder names MUST be delimited with a single opening brace { and a single closing brace }. There MUST NOT be any whitespace between the delimiters and the placeholder name.

    Placeholder names SHOULD be composed only of the characters A-Za-z0-9, underscore _, and period .. The use of other characters is reserved for future modifications of the placeholders specification.

    Implementors MAY use placeholders to implement various escaping strategies and translate logs for display. Users SHOULD NOT pre-escape placeholder values since they can not know in which context the data will be displayed.

    The following is an example implementation of placeholder interpolation provided for reference purposes only:

    /**
    * Interpolates context values into the message placeholders.
    */
    function interpolate($message, array $context = array())
    {
        // build a replacement array with braces around the context keys
        $replace = array();
        foreach ($context as $key => $val) {
            $replace['{' . $key . '}'] = $val;
        }
    
        // interpolate replacement values into the message and return
        return strtr($message, $replace);
    }
    
    // a message with brace-delimited placeholder names
    $message = "User {username} created";
    
    // a context array of placeholder names => replacement values
    $context = array('username' => 'bolivar');
    
    // echoes "User bolivar created"
    echo interpolate($message, $context);

1.3 Context

  • Every method accepts an array as context data. This is meant to hold any extraneous information that does not fit well in a string. The array can contain anything. Implementors MUST ensure they treat context data with as much lenience as possible. A given value in the context MUST NOT throw an exception nor raise any php error, warning or notice.

  • If an Exception object is passed in the context data, it MUST be in the 'exception' key. Logging exceptions is a common pattern and this allows implementors to extract a stack trace from the exception when the log backend supports it. Implementors MUST still verify that the 'exception' key is actually an Exception before using it as such, as it MAY contain anything.

1.4 Helper classes and interfaces

  • The Psr\Log\AbstractLogger class lets you implement the LoggerInterface very easily by extending it and implementing the generic log method. The other eight methods are forwarding the message and context to it.

  • Similarly, using the Psr\Log\LoggerTrait only requires you to implement the generic log method. Note that since traits can not implement interfaces, in this case you still have to implement LoggerInterface.

  • The Psr\Log\NullLogger is provided together with the interface. It MAY be used by users of the interface to provide a fall-back "black hole" implementation if no logger is given to them. However conditional logging may be a better approach if context data creation is expensive.

  • The Psr\Log\LoggerAwareInterface only contains a setLogger(LoggerInterface $logger) method and can be used by frameworks to auto-wire arbitrary instances with a logger.

  • The Psr\Log\LoggerAwareTrait trait can be used to implement the equivalent interface easily in any class. It gives you access to $this->logger.

  • The Psr\Log\LogLevel class holds constants for the eight log levels.

2. Package

The interfaces and classes described as well as relevant exception classes and a test suite to verify your implementation is provided as part of the psr/log package.

3. Psr\Log\LoggerInterface

<?php

namespace Psr\Log;

/**
 * Describes a logger instance
 *
 * The message MUST be a string or object implementing __toString().
 *
 * The message MAY contain placeholders in the form: {foo} where foo
 * will be replaced by the context data in key "foo".
 *
 * The context array can contain arbitrary data, the only assumption that
 * can be made by implementors is that if an Exception instance is given
 * to produce a stack trace, it MUST be in a key named "exception".
 *
 * See https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-3-logger-interface.md
 * for the full interface specification.
 */
interface LoggerInterface
{
    /**
     * System is unusable.
     *
     * @param string $message
     * @param array $context
     * @return null
     */
    public function emergency($message, array $context = array());

    /**
     * Action must be taken immediately.
     *
     * Example: Entire website down, database unavailable, etc. This should
     * trigger the SMS alerts and wake you up.
     *
     * @param string $message
     * @param array $context
     * @return null
     */
    public function alert($message, array $context = array());

    /**
     * Critical conditions.
     *
     * Example: Application component unavailable, unexpected exception.
     *
     * @param string $message
     * @param array $context
     * @return null
     */
    public function critical($message, array $context = array());

    /**
     * Runtime errors that do not require immediate action but should typically
     * be logged and monitored.
     *
     * @param string $message
     * @param array $context
     * @return null
     */
    public function error($message, array $context = array());

    /**
     * Exceptional occurrences that are not errors.
     *
     * Example: Use of deprecated APIs, poor use of an API, undesirable things
     * that are not necessarily wrong.
     *
     * @param string $message
     * @param array $context
     * @return null
     */
    public function warning($message, array $context = array());

    /**
     * Normal but significant events.
     *
     * @param string $message
     * @param array $context
     * @return null
     */
    public function notice($message, array $context = array());

    /**
     * Interesting events.
     *
     * Example: User logs in, SQL logs.
     *
     * @param string $message
     * @param array $context
     * @return null
     */
    public function info($message, array $context = array());

    /**
     * Detailed debug information.
     *
     * @param string $message
     * @param array $context
     * @return null
     */
    public function debug($message, array $context = array());

    /**
     * Logs with an arbitrary level.
     *
     * @param mixed $level
     * @param string $message
     * @param array $context
     * @return null
     */
    public function log($level, $message, array $context = array());
}

4. Psr\Log\LoggerAwareInterface

<?php

namespace Psr\Log;

/**
 * Describes a logger-aware instance
 */
interface LoggerAwareInterface
{
    /**
     * Sets a logger instance on the object
     *
     * @param LoggerInterface $logger
     * @return null
     */
    public function setLogger(LoggerInterface $logger);
}

5. Psr\Log\LogLevel

<?php

namespace Psr\Log;

/**
 * Describes log levels
 */
class LogLevel
{
    const EMERGENCY = 'emergency';
    const ALERT     = 'alert';
    const CRITICAL  = 'critical';
    const ERROR     = 'error';
    const WARNING   = 'warning';
    const NOTICE    = 'notice';
    const INFO      = 'info';
    const DEBUG     = 'debug';
}


Example Implementations of PSR-4

The following are examples illustrate PSR-4 compliant code:

Closure Example

<?php
/**
 * An example of a project-specific implementation.
 * 
 * After registering this autoload function with SPL, the following line
 * would cause the function to attempt to load the \Foo\Bar\Baz\Qux class
 * from /path/to/project/src/Baz/Qux.php:
 * 
 *      new \Foo\Bar\Baz\Qux;
 *      
 * @param string $class The fully-qualified class name.
 * @return void
 */
spl_autoload_register(function ($class) {

    // project-specific namespace prefix
    $prefix = 'Foo\\Bar\\';

    // base directory for the namespace prefix
    $base_dir = __DIR__ . Об этом говорит сайт https://intellect.icu  . '/src/';

    // does the class use the namespace prefix?
    $len = strlen($prefix);
    if (strncmp($prefix, $class, $len) !== 0) {
        // no, move to the next registered autoloader
        return;
    }

    // get the relative class name
    $relative_class = substr($class, $len);

    // replace the namespace prefix with the base directory, replace namespace
    // separators with directory separators in the relative class name, append
    // with .php
    $file = $base_dir . str_replace('\\', '/', $relative_class) . '.php';

    // if the file exists, require it
    if (file_exists($file)) {
        require $file;
    }
});

Class Example

The following is an example class implementation to handle multiple namespaces:

<?php
namespace Example;

/**
 * An example of a general-purpose implementation that includes the optional
 * functionality of allowing multiple base directories for a single namespace
 * prefix.
 * 
 * Given a foo-bar package of classes in the file system at the following
 * paths ...
 * 
 *     /path/to/packages/foo-bar/
 *         src/
 *             Baz.php             # Foo\Bar\Baz
 *             Qux/
 *                 Quux.php        # Foo\Bar\Qux\Quux
 *         tests/
 *             BazTest.php         # Foo\Bar\BazTest
 *             Qux/
 *                 QuuxTest.php    # Foo\Bar\Qux\QuuxTest
 * 
 * ... add the path to the class files for the \Foo\Bar\ namespace prefix
 * as follows:
 * 
 *      <?php
 *      // instantiate the loader
 *      $loader = new \Example\Psr4AutoloaderClass;
 *      
 *      // register the autoloader
 *      $loader->register();
 *      
 *      // register the base directories for the namespace prefix
 *      $loader->addNamespace('Foo\Bar', '/path/to/packages/foo-bar/src');
 *      $loader->addNamespace('Foo\Bar', '/path/to/packages/foo-bar/tests');
 * 
 * The following line would cause the autoloader to attempt to load the
 * \Foo\Bar\Qux\Quux class from /path/to/packages/foo-bar/src/Qux/Quux.php:
 * 
 *      <?php
 *      new \Foo\Bar\Qux\Quux;
 * 
 * The following line would cause the autoloader to attempt to load the 
 * \Foo\Bar\Qux\QuuxTest class from /path/to/packages/foo-bar/tests/Qux/QuuxTest.php:
 * 
 *      <?php
 *      new \Foo\Bar\Qux\QuuxTest;
 */
class Psr4AutoloaderClass
{
    /**
     * An associative array where the key is a namespace prefix and the value
     * is an array of base directories for classes in that namespace.
     *
     * @var array
     */
    protected $prefixes = array();

    /**
     * Register loader with SPL autoloader stack.
     * 
     * @return void
     */
    public function register()
    {
        spl_autoload_register(array($this, 'loadClass'));
    }

    /**
     * Adds a base directory for a namespace prefix.
     *
     * @param string $prefix The namespace prefix.
     * @param string $base_dir A base directory for class files in the
     * namespace.
     * @param bool $prepend If true, prepend the base directory to the stack
     * instead of appending it; this causes it to be searched first rather
     * than last.
     * @return void
     */
    public function addNamespace($prefix, $base_dir, $prepend = false)
    {
        // normalize namespace prefix
        $prefix = trim($prefix, '\\') . '\\';

        // normalize the base directory with a trailing separator
        $base_dir = rtrim($base_dir, DIRECTORY_SEPARATOR) . '/';

        // initialize the namespace prefix array
        if (isset($this->prefixes[$prefix]) === false) {
            $this->prefixes[$prefix] = array();
        }

        // retain the base directory for the namespace prefix
        if ($prepend) {
            array_unshift($this->prefixes[$prefix], $base_dir);
        } else {
            array_push($this->prefixes[$prefix], $base_dir);
        }
    }

    /**
     * Loads the class file for a given class name.
     *
     * @param string $class The fully-qualified class name.
     * @return mixed The mapped file name on success, or boolean false on
     * failure.
     */
    public function loadClass($class)
    {
        // the current namespace prefix
        $prefix = $class;

        // work backwards through the namespace names of the fully-qualified
        // class name to find a mapped file name
        while (false !== $pos = strrpos($prefix, '\\')) {

            // retain the trailing namespace separator in the prefix
            $prefix = substr($class, 0, $pos + 1);

            // the rest is the relative class name
            $relative_class = substr($class, $pos + 1);

            // try to load a mapped file for the prefix and relative class
            $mapped_file = $this->loadMappedFile($prefix, $relative_class);
            if ($mapped_file) {
                return $mapped_file;
            }

            // remove the trailing namespace separator for the next iteration
            // of strrpos()
            $prefix = rtrim($prefix, '\\');   
        }

        // never found a mapped file
        return false;
    }

    /**
     * Load the mapped file for a namespace prefix and relative class.
     * 
     * @param string $prefix The namespace prefix.
     * @param string $relative_class The relative class name.
     * @return mixed Boolean false if no mapped file can be loaded, or the
     * name of the mapped file that was loaded.
     */
    protected function loadMappedFile($prefix, $relative_class)
    {
        // are there any base directories for this namespace prefix?
        if (isset($this->prefixes[$prefix]) === false) {
            return false;
        }

        // look through base directories for this namespace prefix
        foreach ($this->prefixes[$prefix] as $base_dir) {

            // replace the namespace prefix with the base directory,
            // replace namespace separators with directory separators
            // in the relative class name, append with .php
            $file = $base_dir
                  . str_replace('\\', '/', $relative_class)
                  . '.php';

            // if the mapped file exists, require it
            if ($this->requireFile($file)) {
                // yes, we're done
                return $file;
            }
        }

        // never found it
        return false;
    }

    /**
     * If a file exists, require it from the file system.
     * 
     * @param string $file The file to require.
     * @return bool True if the file exists, false if not.
     */
    protected function requireFile($file)
    {
        if (file_exists($file)) {
            require $file;
            return true;
        }
        return false;
    }
}

Unit Tests

The following example is one way of unit testing the above class loader:

<?php
namespace Example\Tests;

class MockPsr4AutoloaderClass extends Psr4AutoloaderClass
{
    protected $files = array();

    public function setFiles(array $files)
    {
        $this->files = $files;
    }

    protected function requireFile($file)
    {
        return in_array($file, $this->files);
    }
}

class Psr4AutoloaderClassTest extends \PHPUnit_Framework_TestCase
{
    protected $loader;

    protected function setUp()
    {
        $this->loader = new MockPsr4AutoloaderClass;

        $this->loader->setFiles(array(
            '/vendor/foo.bar/src/ClassName.php',
            '/vendor/foo.bar/src/DoomClassName.php',
            '/vendor/foo.bar/tests/ClassNameTest.php',
            '/vendor/foo.bardoom/src/ClassName.php',
            '/vendor/foo.bar.baz.dib/src/ClassName.php',
            '/vendor/foo.bar.baz.dib.zim.gir/src/ClassName.php',
        ));

        $this->loader->addNamespace(
            'Foo\Bar',
            '/vendor/foo.bar/src'
        );

        $this->loader->addNamespace(
            'Foo\Bar',
            '/vendor/foo.bar/tests'
        );

        $this->loader->addNamespace(
            'Foo\BarDoom',
            '/vendor/foo.bardoom/src'
        );

        $this->loader->addNamespace(
            'Foo\Bar\Baz\Dib',
            '/vendor/foo.bar.baz.dib/src'
        );

        $this->loader->addNamespace(
            'Foo\Bar\Baz\Dib\Zim\Gir',
            '/vendor/foo.bar.baz.dib.zim.gir/src'
        );
    }

    public function testExistingFile()
    {
        $actual = $this->loader->loadClass('Foo\Bar\ClassName');
        $expect = '/vendor/foo.bar/src/ClassName.php';
        $this->assertSame($expect, $actual);

        $actual = $this->loader->loadClass('Foo\Bar\ClassNameTest');
        $expect = '/vendor/foo.bar/tests/ClassNameTest.php';
        $this->assertSame($expect, $actual);
    }

    public function testMissingFile()
    {
        $actual = $this->loader->loadClass('No_Vendor\No_Package\NoClass');
        $this->assertFalse($actual);
    }

    public function testDeepFile()
    {
        $actual = $this->loader->loadClass('Foo\Bar\Baz\Dib\Zim\Gir\ClassName');
        $expect = '/vendor/foo.bar.baz.dib.zim.gir/src/ClassName.php';
        $this->assertSame($expect, $actual);
    }

    public function testConfusion()
    {
        $actual = $this->loader->loadClass('Foo\Bar\DoomClassName');
        $expect = '/vendor/foo.bar/src/DoomClassName.php';
        $this->assertSame($expect, $actual);

        $actual = $this->loader->loadClass('Foo\BarDoom\ClassName');
        $expect = '/vendor/foo.bardoom/src/ClassName.php';
        $this->assertSame($expect, $actual);
    }
}

PSR-4 Meta Document

 

1. Summary

The purpose is to specify the rules for an interoperable PHP autoloader that maps namespaces to file system paths, and that can co-exist with any other SPL registered autoloader. This would be an addition to, not a replacement for, PSR-0.

2. Why Bother?

History of PSR-0

The PSR-0 class naming and autoloading standard rose out of the broad acceptance of the Horde/PEAR convention under the constraints of PHP 5.2 and previous. With that convention, the tendency was to put all PHP source classes in a single main directory, using underscores in the class name to indicate pseudo-namespaces, like so:

/path/to/src/
    VendorFoo/
        Bar/
            Baz.php     # VendorFoo_Bar_Baz
    VendorDib/
        Zim/
            Gir.php     # Vendor_Dib_Zim_Gir

With the release of PHP 5.3 and the availability of namespaces proper, PSR-0 was introduced to allow both the old Horde/PEAR underscore mode and the use of the new namespace notation. Underscores were still allowed in the class name to ease transition from the older namespace naming to the newer naming, and thereby to encourage wider adoption.

/path/to/src/
    VendorFoo/
        Bar/
            Baz.php     # VendorFoo_Bar_Baz
    VendorDib/
        Zim/
            Gir.php     # VendorDib_Zim_Gir
    Irk_Operation/
        Impending_Doom/
            V1.php
            V2.php      # Irk_Operation\Impending_Doom\V2

This structure is informed very much by the fact that the PEAR installer moved source files from PEAR packages into a single central directory.

Along Comes Composer

With Composer, package sources are no longer copied to a single global location. They are used from their installed location and are not moved around. This means that with Composer there is no "single main directory" for PHP sources as with PEAR. Instead, there are multiple directories; each package is in a separate directory for each project.

To meet the requirements of PSR-0, this leads to Composer packages looking like this:

vendor/
    vendor_name/
        package_name/
            src/
                Vendor_Name/
                    Package_Name/
                        ClassName.php       # Vendor_Name\Package_Name\ClassName
            tests/
                Vendor_Name/
                    Package_Name/
                        ClassNameTest.php   # Vendor_Name\Package_Name\ClassNameTest

The "src" and "tests" directories have to include vendor and package directory names. This is an artifact of PSR-0 compliance.

Many find this structure to be deeper and more-repetitive than necessary. This proposal suggests that an additional or superseding PSR would be useful so that we can have packages that look more like the following:

vendor/
    vendor_name/
        package_name/
            src/
                ClassName.php       # Vendor_Name\Package_Name\ClassName
            tests/
                ClassNameTest.php   # Vendor_Name\Package_Name\ClassNameTest

This would require an implementation of what was initially called "package-oriented autoloading" (as vs the traditional "direct class-to-file autoloading").

Package-Oriented Autoloading

It's difficult to implement package-oriented autoloading via an extension or amendment to PSR-0, because PSR-0 does not allow for an intercessory path between any portions of the class name. This means the implementation of a package-oriented autoloader would be more complicated than PSR-0. However, it would allow for cleaner packages.

Initially, the following rules were suggested:

  1. Implementors MUST use at least two namespace levels: a vendor name, and package name within that vendor. (This top-level two-name combination is hereinafter referred to as the vendor-package name or the vendor-package namespace.)

  2. Implementors MUST allow a path infix between the vendor-package namespace and the remainder of the fully qualified class name.

  3. The vendor-package namespace MAY map to any directory. The remaining portion of the fully-qualified class name MUST map the namespace names to identically-named directories, and MUST map the class name to an identically-named file ending in .php.

Note that this means the end of underscore-as-directory-separator in the class name. One might think underscores should be honored as they are under PSR-0, but seeing as their presence in that document is in reference to transitioning away from PHP 5.2 and previous pseudo-namespacing, it is acceptable to remove them here as well.

3. Scope

3.1 Goals

  • Retain the PSR-0 rule that implementors MUST use at least two namespace levels: a vendor name, and package name within that vendor.

  • Allow a path infix between the vendor-package namespace and the remainder of the fully qualified class name.

  • Allow the vendor-package namespace MAY map to any directory, perhaps multiple directories.

  • End the honoring of underscores in class names as directory separators

3.2 Non-Goals

  • Provide a general transformation algorithm for non-class resources

4. Approaches

4.1 Chosen Approach

This approach retains key characteristics of PSR-0 while eliminating the deeper directory structures it requires. In addition, it specifies certain additional rules that make implementations explicitly more interoperable.

Although not related to directory mapping, the final draft also specifies how autoloaders should handle errors. Specifically, it forbids throwing exceptions or raising errors. The reason is two-fold.

  1. Autoloaders in PHP are explicitly designed to be stackable so that if one autoloader cannot load a class another has a chance to do so. Having an autoloader trigger a breaking error condition violates that compatibility.

  2. class_exists() and interface_exists() allow "not found, even after trying to autoload" as a legitimate, normal use case. An autoloader that throws exceptions renders class_exists() unusable, which is entirely unacceptable from an interoperability standpoint. Autoloaders that wish to provide additional debugging information in a class-not-found case should do so via logging instead, either to a PSR-3 compatible logger or otherwise.

Pros:

  • Shallower directory structures

  • More flexible file locations

  • Stops underscore in class name from being honored as directory separator

  • Makes implementations more explicitly interoperable

Cons:

  • It is no longer possible, as under PSR-0, to merely examine a class name to determine where it is in the file system (the "class-to-file" convention inherited from Horde/PEAR).

4.2 Alternative: Stay With PSR-0 Only

Staying with PSR-0 only, although reasonable, does leave us with relatively deeper directory structures.

Pros:

  • No need to change anyone's habits or implementations

Cons:

  • Leaves us with deeper directory structures

  • Leaves us with underscores in the class name being honored as directory separators

4.3 Alternative: Split Up Autoloading And Transformation

Beau Simensen and others suggested that the transformation algorithm might be split out from the autoloading proposal, so that the transformation rules could be referenced by other proposals. After doing the work to separate them, followed by a poll and some discussion, the combined version (i.e., transformation rules embedded in the autoloader proposal) was revealed as the preference.

Pros:

  • Transformation rules could be referenced separately by other proposal

Cons:

  • Not in line with the wishes of poll respondents and some collaborators

4.4 Alternative: Use More Imperative And Narrative Language

After the second vote was pulled by a Sponsor after hearing from multiple +1 voters that they supported the idea but did not agree with (or understand) the wording of the proposal, there was a period during which the voted-on proposal was expanded with greater narrative and somewhat more imperative language. This approach was decried by a vocal minority of participants. After some time, Beau Simensen started an experimental revision with an eye to PSR-0; the Editor and Sponsors favored this more terse approach and shepherded the version now under consideration, written by Paul M. Jones and contributed to by many.

Compatability Note with PHP 5.3.2 and below

PHP versions before 5.3.3 do not strip the leading namespace separator, so the responsibility to look out for this falls on the implementation. Failing to strip the leading namespace seperator could lead to unexpected behavior.

5. People

5.1 Editor

  • Paul M. Jones, Solar/Aura

5.2 Sponsors

  • Phil Sturgeon, PyroCMS (Coordinator)
  • Larry Garfield, Drupal

5.3 Contributors

  • Andreas Hennings
  • Bernhard Schussek
  • Beau Simensen
  • Donald Gilbert
  • Mike van Riel
  • Paul Dragoonis
  • Too many others to name and count

6. Votes

  • Entrance Vote: https://groups.google.com/d/msg/php-fig/_LYBgfcEoFE/ZwFTvVTIl4AJ

  • Acceptance Vote:

    • 1st attempt: https://groups.google.com/forum/#!topic/php-fig/Ua46E344_Ls, presented prior to new workflow; aborted due to accidental proposal modification

    • 2nd attempt: https://groups.google.com/forum/#!topic/php-fig/NWfyAeF7Psk, cancelled at the discretion of the sponsor https://groups.google.com/forum/#!topic/php-fig/t4mW2TQF7iE

    • 3rd attempt: TBD

7. Relevant Links

  • Autoloader, round 4
  • POLL: Autoloader: Split or Combined?
  • PSR-X autoloader spec: Loopholes, ambiguities
  • Autoloader: Combine Proposals?
  • Package-Oriented Autoloader, Round 2
  • Autoloader: looking again at namespace
  • DISCUSSION: Package-Oriented Autoloader - vote against
  • VOTE: Package-Oriented Autoloader
  • Proposal: Package-Oriented Autoloader
  • Towards a Package Oriented Autoloader
  • List of Alternative PSR-4 Proposals
  • Summary of [post-Acceptance Vote pull] PSR-4 discussions

Autoloader

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.

1. Overview

This PSR describes a specification for autoloading classes from file paths. It is fully interoperable, and can be used in addition to any other autoloading specification, including PSR-0. This PSR also describes where to place files that will be autoloaded according to the specification.

2. Specification

  1. The term "class" refers to classes, interfaces, traits, and other similar structures.

  2. A fully qualified class name has the following form:

    \<NamespaceName>(\<SubNamespaceNames>)*\<ClassName>
    
    1. The fully qualified class name MUST have a top-level namespace name, also known as a "vendor namespace".

    2. The fully qualified class name MAY have one or more sub-namespace names.

    3. The fully qualified class name MUST have a terminating class name.

    4. Underscores have no special meaning in any portion of the fully qualified class name.

    5. Alphabetic characters in the fully qualified class name MAY be any combination of lower case and upper case.

    6. All class names MUST be referenced in a case-sensitive fashion.

  3. When loading a file that corresponds to a fully qualified class name ...

    1. A contiguous series of one or more leading namespace and sub-namespace names, not including the leading namespace separator, in the fully qualified class name (a "namespace prefix") corresponds to at least one "base directory".

    2. The contiguous sub-namespace names after the "namespace prefix" correspond to a subdirectory within a "base directory", in which the namespace separators represent directory separators. The subdirectory name MUST match the case of the sub-namespace names.

    3. The terminating class name corresponds to a file name ending in .php. The file name MUST match the case of the terminating class name.

  4. Autoloader implementations MUST NOT throw exceptions, MUST NOT raise errors of any level, and SHOULD NOT return a value.

3. Examples

The table below shows the corresponding file path for a given fully qualified class name, namespace prefix, and base directory.

Fully Qualified Class NameNamespace PrefixBase DirectoryResulting File Path
\Acme\Log\Writer\File_Writer Acme\Log\Writer ./acme-log-writer/lib/ ./acme-log-writer/lib/File_Writer.php
\Aura\Web\Response\Status Aura\Web /path/to/aura-web/src/ /path/to/aura-web/src/Response/Status.php
\Symfony\Core\Request Symfony\Core ./vendor/Symfony/Core/ ./vendor/Symfony/Core/Request.php
\Zend\Acl Zend /usr/includes/Zend/ /usr/includes/Zend/Acl.php

For example implementations of autoloaders conforming to the specification, please see the examples file. Example implementations MUST NOT be regarded as part of the specification and MAY change at any time.

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создано: 2015-02-16
обновлено: 2021-03-13
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Разработка программного обеспечения и информационных систем

Термины: Разработка программного обеспечения и информационных систем