PHP: Callback 回调类型_Manual_20160511

Callback 回调类型

自 PHP 5.4 起可用 callable 类型指定回调类型 callback。本文档基于同样理由使用 callback 类型信息。

一些函数如 call_user_func() 或 usort() 可以接受用户自定义的回调函数作为参数。回调函数不止可以是简单函数，还可以是对象的方法，包括静态类方法。

传递

一个 PHP 的函数以 string 类型传递其名称。可以使用任何内置或用户自定义函数，但除了语言结构例如：array()，echo，empty()，eval()，exit()，isset()，list()，print 或 unset()。

一个已实例化的对象的方法被作为数组传递，下标 0 包含该对象，下标 1 包含方法名。

静态类方法也可不经实例化该类的对象而传递，只要在下标 0 中包含类名而不是对象。自 PHP 5.2.3 起，也可以传递 'ClassName::methodName'。

除了普通的用户自定义函数外，create_function() 可以用来创建一个匿名回调函数。自 PHP 5.3.0 起也可传递 closure 给回调参数。

Example #1 回调函数示例

<?php 

// An example callback function
function my_callback_function() {
    echo 'hello world!';
}

// An example callback method
class MyClass {
    static function myCallbackMethod() {
        echo 'Hello World!';
    }
}

// Type 1: Simple callback
call_user_func('my_callback_function'); 

// Type 2: Static class method call
call_user_func(array('MyClass', 'myCallbackMethod')); 

// Type 3: Object method call
$obj = new MyClass();
call_user_func(array($obj, 'myCallbackMethod'));

// Type 4: Static class method call (As of PHP 5.2.3)
call_user_func('MyClass::myCallbackMethod');

// Type 5: Relative static class method call (As of PHP 5.3.0)
class A {
    public static function who() {
        echo "A\n";
    }
}

class B extends A {
    public static function who() {
        echo "B\n";
    }
}

call_user_func(array('B', 'parent::who')); // A
?>

Example #2 使用 Closure 的示例

<?php
// Our closure
$double = function($a) {
    return $a * 2;
};

// This is our range of numbers
$numbers = range(1, 5);

// Use the closure as a callback here to 
// double the size of each element in our 
// range
$new_numbers = array_map($double, $numbers);

print implode(' ', $new_numbers);
?>

以上例程会输出：

2 4 6 8 10

Note: 在 PHP 4 中，需要使用一个引用来创建一个指向具体对象的回调函数，而不是一个拷贝。参见引用的解释。

Note:
在函数中注册有多个回调内容时(如使用call_user_func() 与 call_user_func_array())，如在前一个回调中有未捕获的异常，其后的将不再被调用。

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User Contributed Notes 10 notes

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187

edanschwartz at gmail dot com ¶

1 year ago

You can use 'self::methodName' as a callable, but this is dangerous. Consider this example:

<?php
class Foo {
    public static function doAwesomeThings() {
        FunctionCaller::callIt('self::someAwesomeMethod');
    }

    public static function someAwesomeMethod() {
        // fantastic code goes here.
    }
}

class FunctionCaller {
    public static function callIt(callable $func) {
        call_user_func($func);
    }
}

Foo::doAwesomeThings();
?>

This results in an error:
Warning: class 'FunctionCaller' does not have a method 'someAwesomeMethod'.

For this reason you should always use the full class name:
<?php
FunctionCaller::callIt('Foo::someAwesomeMethod');
?>

I believe this is because there is no way for FunctionCaller to know that the string 'self' at one point referred to to `Foo`.

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181

computrius at gmail dot com ¶

2 years ago

When specifying a call back in array notation (ie. array($this, "myfunc") ) the method can be private if called from inside the class, but if you call it from outside you'll get a warning:

<?php

class mc {
   public function go(array $arr) {
       array_walk($arr, array($this, "walkIt"));
   }

   private function walkIt($val) {
       echo $val . "<br />";
   }

    public function export() {
        return array($this, 'walkIt');
    }
}

$data = array(1,2,3,4);

$m = new mc;
$m->go($data); // valid

array_walk($data, $m->export()); // will generate warning

?>

Output:
1<br />2<br />3<br />4<br />
Warning: array_walk() expects parameter 2 to be a valid callback, cannot access private method mc::walkIt() in /in/tfh7f on line 22

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193

steve at mrclay dot org ¶

3 years ago

Performance note: The callable type hint, like is_callable(), will trigger an autoload of the class if the value looks like a static method callback.

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152

Riikka K ¶

1 year ago

A note on differences when calling callbacks as "variable functions" without the use of call_user_func() (e.g. "<?php $callback = 'printf'; $callback('Hello World!') ?>"):

- Using the name of a function as string has worked since at least 4.3.0
- Calling anonymous functions and invokable objects has worked since 5.3.0
- Using the array structure [$object, 'method'] has worked since 5.4.0

Note, however, that the following are not supported when calling callbacks as variable functions, even though they are supported by call_user_func():

- Calling static class methods via strings such as 'foo::doStuff'
- Calling parent method using the [$object, 'parent::method'] array structure

All of these cases are correctly recognized as callbacks by the 'callable' type hint, however. Thus, the following code will produce an error "Fatal error: Call to undefined function foo::doStuff() in /tmp/code.php on line 4":

<?php
class foo {
    static function callIt(callable $callback) {
        $callback();
    }
    
    static function doStuff() {
        echo "Hello World!";
    }
}

foo::callIt('foo::doStuff');
?>

The code would work fine, if we replaced the '$callback()' with 'call_user_func($callback)' or if we used the array ['foo', 'doStuff'] as the callback instead.

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196

andrewbessa at gmail dot com ¶

3 years ago

You can also use the $this variable to specify a callback:

<?php
class MyClass {

    public $property = 'Hello World!';

    public function MyMethod()
    {
        call_user_func(array($this, 'myCallbackMethod'));
    }

    public function MyCallbackMethod()
    {
        echo $this->property;
    }

}
?>

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171

metamarkers at gmail dot com ¶

2 years ago

you can pass an object as a callable if its class defines the __invoke() magic method..

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157

Yzmir Ramirez ¶

2 years ago

> As of PHP 5.2.3, it is also possible to pass 'ClassName::methodName'

You can also use 'self::methodName'.  This works in PHP 5.2.12 for me.

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mariano dot REMOVE dot perez dot rodriguez at gmail dot com ¶

7 months ago

I needed a function that would determine the type of callable being passed, and, eventually,
normalized it to some extent. Here's what I came up with:

<?php

/**
 * The callable types and normalizations are given in the table below:
 *
 *  Callable                        | Normalization                   | Type
 * ---------------------------------+---------------------------------+--------------
 *  function (...) use (...) {...}  | function (...) use (...) {...}  | 'closure'
 *  $object                         | $object                         | 'invocable'
 *  "function"                      | "function"                      | 'function'
 *  "class::method"                 | ["class", "method"]             | 'static'
 *  ["class", "parent::method"]     | ["parent of class", "method"]   | 'static'
 *  ["class", "self::method"]       | ["class", "method"]             | 'static'
 *  ["class", "method"]             | ["class", "method"]             | 'static'
 *  [$object, "parent::method"]     | [$object, "parent::method"]     | 'object'
 *  [$object, "self::method"]       | [$object, "method"]             | 'object'
 *  [$object, "method"]             | [$object, "method"]             | 'object'
 * ---------------------------------+---------------------------------+--------------
 *  other callable                  | idem                            | 'unknown'
 * ---------------------------------+---------------------------------+--------------
 *  not a callable                  | null                            | false
 *
 * If the "strict" parameter is set to true, additional checks are
 * performed, in particular:
 *  - when a callable string of the form "class::method" or a callable array
 *    of the form ["class", "method"] is given, the method must be a static one,
 *  - when a callable array of the form [$object, "method"] is given, the
 *    method must be a non-static one.
 *
 */
function callableType($callable, $strict = true, callable& $norm = null) {
  if (!is_callable($callable)) {
    switch (true) {
      case is_object($callable):
        $norm = $callable;
        return 'Closure' === get_class($callable) ? 'closure' : 'invocable';
      case is_string($callable):
        $m    = null;
        if (preg_match('~^(?<class>[a-z_][a-z0-9_]*)::(?<method>[a-z_][a-z0-9_]*)$~i', $callable, $m)) {
          list($left, $right) = [$m['class'], $m['method']];
          if (!$strict || (new \ReflectionMethod($left, $right))->isStatic()) {
            $norm = [$left, $right];
            return 'static';
          }
        } else {
          $norm = $callable;
          return 'function';
        }
        break;
      case is_array($callable):
        $m = null;
        if (preg_match('~^(:?(?<reference>self|parent)::)?(?<method>[a-z_][a-z0-9_]*)$~i', $callable[1], $m)) {
          if (is_string($callable[0])) {
            if ('parent' === strtolower($m['reference'])) {
              list($left, $right) = [get_parent_class($callable[0]), $m['method']];
            } else {
              list($left, $right) = [$callable[0], $m['method']];
            }
            if (!$strict || (new \ReflectionMethod($left, $right))->isStatic()) {
              $norm = [$left, $right];
              return 'static';
            }
          } else {
            if ('self' === strtolower($m['reference'])) {
              list($left, $right) = [$callable[0], $m['method']];
            } else {
              list($left, $right) = $callable;
            }
            if (!$strict || !(new \ReflectionMethod($left, $right))->isStatic()) {
              $norm = [$left, $right];
              return 'object';
            }
          }
        }
        break;
    }
    $norm = $callable;
    return 'unknown';
  }
  $norm = null;
  return false;
}

?>

Hope someone else finds it useful.

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bradyn at NOSPAM dot bradynpoulsen dot com ¶

28 days ago

When trying to make a callable from a function name located in a namespace, you MUST give the fully qualified function name (regardless of the current namespace or use statements).

<?php

namespace MyNamespace;

function doSomethingFancy($arg1)
{
    // do something...
}

$values = [1, 2, 3];

array_map('doSomethingFancy', $values);
// array_map() expects parameter 1 to be a valid callback, function 'doSomethingFancy' not found or invalid function name

array_map('MyNamespace\doSomethingFancy', $values);
// => [..., ..., ...]

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pawel dot tadeusz dot niedzielski at gmail dot com ¶

29 days ago

@edanschwartz at gmail dot com

You can use ::class property to always indicate the class you're in when using static methods:

<?php
class Foo {
    public static function doAwesomeThings() {
        FunctionCaller::callIt(self::class . '::someAwesomeMethod');
    }

    public static function someAwesomeMethod() {
        // fantastic code goes here.
    }
}

class FunctionCaller {
    public static function callIt(callable $func) {
        call_user_func($func);
    }
}

Foo::doAwesomeThings();
?>

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