forward_static_call

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

forward_static_callCall a static method

Descrizione

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.

Elenco dei parametri

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.

Valori restituiti

Returns the function result, or false on error.

Esempi

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";
}

?>

Il precedente esempio visualizzerĂ :

B
B more,args 
C other,args

Vedere anche:

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User Contributed Notes 2 notes

up
2
arthur dot techarts at gmail dot com
13 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
0
jhibbard at gmail dot com
12 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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