forward_static_call

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

    forward_static_call — Call a static method

    Description

    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.

    Parameters

    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.

    Return Values

    Returns the function result, or false on error.

    Examples

    Example #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";
    }

    ?>

    The above example will output:

    B
B more,args 
C other,args

    See Also

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    User Contributed Notes 2 notes

    up
    5
    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>';
    ?>
    up
    1
    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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