forward_static_call

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

forward_static_call — Call a static method

Опис

forward_static_call(callable $callback, mixed ...$args): mixed

Calls a user defined function or method given by the callback parameter, with the following arguments. This function must be called within a method context, it can't be used outside a class. It uses the late static binding.

Параметри

callback: The function or method to be called. This parameter may be an array, with the name of the class, and the method, or a string, with a function name.
args: Zero or more parameters to be passed to the function.

Значення, що повертаються

Returns the function result, or false on error.

Приклади

Приклад #1 forward_static_call() example

<?php

class A
{
    const NAME = 'A';
    public static function test() {
        $args = func_get_args();
        echo static::NAME, " ".join(',', $args)." \n";
    }
}

class B extends A
{
    const NAME = 'B';

    public static function test() {
        echo self::NAME, "\n";
        forward_static_call(array('A', 'test'), 'more', 'args');
        forward_static_call( 'test', 'other', 'args');
    }
}

B::test('foo');

function test() {
        $args = func_get_args();
        echo "C ".join(',', $args)." \n";
    }

?>

Поданий вище приклад виведе:

B
B more,args 
C other,args

Прогляньте також

forward_static_call_array() - Call a static method and pass the arguments as array
call_user_func_array() - Call a callback with an array of parameters
call_user_func() - Call the callback given by the first parameter
is_callable() - Verify that a value can be called as a function from the current scope

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User Contributed Notes 2 notes

down

arthur dot techarts at gmail dot com ¶

14 years ago

Example to understand this function and difference with call_user_func:

<?php
class Beer {
    const NAME = 'Beer!';
    public static function printed(){
        echo 'static Beer:NAME = '. static::NAME . PHP_EOL;
    }
}

class Ale extends Beer {
    const NAME = 'Ale!';
    public static function printed(){
        forward_static_call(array('parent','printed'));
        call_user_func(array('parent','printed'));

        forward_static_call(array('Beer','printed'));
        call_user_func(array('Beer','printed'));
    }
}

Ale::printed();
echo '</pre>';
?>

down

jhibbard at gmail dot com ¶

13 years ago

Example usage via calls outside of the class and within an object:<?php/** * @author Jonathon Hibbard */class foo {  # used to verify we're actually setting something..  private static $value = '';  /**   * Simple setter for the static method setValue...   */  public static function set($method_identifier, $value_to_pass = '') {    # make sure we have the right method format...    # another semi-useful example is like this (useful for REST-like requests...): str_replace(" ", "", ucwords(str_replace("_", " ",  $method_identifier)));    $static_method = 'set' . ucfirst(strtolower(trim($method_identifier)));    if(method_exists(__CLASS__, $static_method)) {      //Note:  this will not work and will throw PHP Parse error:  syntax error, unexpected '::'      //__CLASS__::$static_method($value_to_pass);      foo::$static_method($value_to_pass);      echo "\tCalling forward_static_call with pure string and value param:\n";      forward_static_call(__CLASS__ . "::" . $static_method, $value_to_pass);      echo "\tCalling forward_static_call with class, method array and value param:\n";      forward_static_call(array(__CLASS__, $static_method), $value_to_pass);    }  }  /**   * Set self::$value to something?   */  public static function setValue($value_recieved = '') {    echo "\t\tsetValue called with param of " . var_export($value_recieved, true) . "!\n";    echo "\t\tSetting Private 'value'...\n";    self::$value = $value_recieved;    echo "\t\tChecking the Private 'value':\n";    if(!empty(self::$value)) {      echo "\t\t\tPrivate 'value' was set to '" . self::$value . "' as expected!\n";    } else {      echo "\t\t\tPrivate 'value' was not set!\n";    }    # Reset...    self::$value = '';  }  /**   * Create an object and test calling the static method from within this realm...   */  public function __construct() {    echo "\tCalling from within constructor..\n";    foo::set('value','Something else from within the instance!');  }}echo "\n============ Calling by static method first ============\n";foo::set('value','Something from outside of the foo class!');echo "\n============ Calling by static method without a value next ============\n";foo::set('value');echo "\n============ Calling by createing an instance next ============\n";new foo();?>

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