(PHP 4 >= 4.0.4, PHP 5)
call_user_func_array — Call a callback with an array of parameters
Calls the callback given by the first parameter with
the parameters in param_arr.
callback
The callable to be called.
param_arr
The parameters to be passed to the callback, as an indexed array.
Returns the return value of the callback, or FALSE on error.
| Wersja | Opis |
|---|---|
| 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.
|
Przykład #1 call_user_func_array() example
<?php
function foobar($arg, $arg2) {
echo __FUNCTION__, " got $arg and $arg2\n";
}
class foo {
function bar($arg, $arg2) {
echo __METHOD__, " got $arg and $arg2\n";
}
}
// Call the foobar() function with 2 arguments
call_user_func_array("foobar", array("one", "two"));
// Call the $foo->bar() method with 2 arguments
$foo = new foo;
call_user_func_array(array($foo, "bar"), array("three", "four"));
?>
Powyższy przykład wyświetli coś podobnego do:
foobar got one and two foo::bar got three and four
Przykład #2 call_user_func_array() using namespace name
<?php
namespace Foobar;
class Foo {
static public function test($name) {
print "Hello {$name}!\n";
}
}
// As of PHP 5.3.0
call_user_func_array(__NAMESPACE__ .'\Foo::test', array('Hannes'));
// As of PHP 5.3.0
call_user_func_array(array(__NAMESPACE__ .'\Foo', 'test'), array('Philip'));
?>
Powyższy przykład wyświetli coś podobnego do:
Hello Hannes! Hello Philip!
Przykład #3 Using lambda function
<?php
$func = function($arg1, $arg2) {
return $arg1 * $arg2;
};
var_dump(call_user_func_array($func, array(2, 4))); /* As of PHP 5.3.0 */
?>
Powyższy przykład wyświetli:
int(8)
Informacja:
Before PHP 5.4, referenced variables in
param_arrare passed to the function by reference, regardless of whether the function expects the respective parameter to be passed by reference. This form of call-time pass by reference does not emit a deprecation notice, but it is nonetheless deprecated, and has been removed in PHP 5.4. Furthermore, this does not apply to internal functions, for which the function signature is honored. Passing by value when the function expects a parameter by reference results in a warning and having call_user_func() returnFALSE(there is, however, an exception for passed values with reference count = 1, such as in literals, as these can be turned into references without ill effects — but also without writes to that value having any effect —; do not rely in this behavior, though, as the reference count is an implementation detail and the soundness of this behavior is questionable).
Informacja:
Wywołania zwrotne zdefiniowane za pomocą takich funkcji jak call_user_func() i call_user_func_array() nie zostaną aktywowane jeśli w poprzednim wywołaniu zostanie wygenerowany nieobsłużony wyjątek.