(PHP 4, PHP 5, PHP 7)
call_user_func — Call the callback given by the first parameter
Calls the callback given by the first parameter and passes
the remaining parameters as arguments.
callbackThe callable to be called.
...Zero or more parameters to be passed to the callback.
Notă:
Note that the parameters for call_user_func() are not passed by reference.
Example #1 call_user_func() example and references
<?php
error_reporting(E_ALL);
function increment(&$var)
{
$var++;
}
$a = 0;
call_user_func('increment', $a);
echo $a."\n";
// You can use this instead
call_user_func_array('increment', array(&$a));
echo $a."\n";
?>Exemplul de mai sus va afișa:
Warning: Parameter 1 to increment() expected to be a reference, value given in … 0 1
Returns the return value of the callback.
| Versiune | Descriere |
|---|---|
| 5.3.0 |
The interpretation of object oriented keywords like parent
and self has changed. Previously, calling them using the
double colon syntax would emit an E_STRICT warning because
they were interpreted as static.
|
| 5.3.0 |
If the called function expects a parameter to be passed by reference, an
E_WARNING is now issued.
|
Example #2 call_user_func() example
<?php
function barber($type)
{
echo "You wanted a $type haircut, no problem\n";
}
call_user_func('barber', "mushroom");
call_user_func('barber', "shave");
?>
Exemplul de mai sus va afișa:
You wanted a mushroom haircut, no problem You wanted a shave haircut, no problem
Example #3 call_user_func() using namespace name
<?php
namespace Foobar;
class Foo {
static public function test() {
print "Hello world!\n";
}
}
call_user_func(__NAMESPACE__ .'\Foo::test'); // As of PHP 5.3.0
call_user_func(array(__NAMESPACE__ .'\Foo', 'test')); // As of PHP 5.3.0
?>
Exemplul de mai sus va afișa:
Hello world! Hello world!
Example #4 Using a class method with call_user_func()
<?php
class myclass {
static function say_hello()
{
echo "Hello!\n";
}
}
$classname = "myclass";
call_user_func(array($classname, 'say_hello'));
call_user_func($classname .'::say_hello'); // As of 5.2.3
$myobject = new myclass();
call_user_func(array($myobject, 'say_hello'));
?>
Exemplul de mai sus va afișa:
Hello! Hello! Hello!
Example #5 Using lambda function with call_user_func()
<?php
call_user_func(function($arg) { print "[$arg]\n"; }, 'test'); /* As of PHP 5.3.0 */
?>
Exemplul de mai sus va afișa:
[test]
Notă:
Funcțiile de apel invers înregistrate cu astfel de funcții ca call_user_func() și call_user_func_array() nu vor fi apelate dacă există o excepție neinterceptată emisă într-un apel precedent.