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call_user_func_array

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

call_user_func_arrayCall a callback with an array of parameters

Beschreibung

call_user_func_array(callable $callback, array $args): mixed

Calls the callback given by the first parameter with the parameters in args.

Parameter-Liste

callback

The callable to be called.

args

The parameters to be passed to the callback, as an array.

If the keys of args are all numeric, the keys are ignored and each element will be passed to callback as a positional argument, in order.

If any keys of args are strings, those elements will be passed to callback as named arguments, with the name given by the key.

It is a fatal error to have a numeric key in args appear after a string key, or to have a string key that does not match the name of any parameter of callback.

Rückgabewerte

Returns the return value of the callback, or false on error.

Changelog

Version Beschreibung
8.0.0 args keys will now be interpreted as parameter names, instead of being silently ignored.

Beispiele

Beispiel #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"));
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

foobar got one and two
foo::bar got three and four

Beispiel #2 call_user_func_array() using namespace name

<?php

namespace Foobar;

class
Foo {
static public function
test($name) {
print
"Hello {$name}!\n";
}
}

call_user_func_array(__NAMESPACE__ .'\Foo::test', array('Hannes'));

call_user_func_array(array(__NAMESPACE__ .'\Foo', 'test'), array('Philip'));

?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

Hello Hannes!
Hello Philip!

Beispiel #3 Using lambda function

<?php

$func
= function($arg1, $arg2) {
return
$arg1 * $arg2;
};

var_dump(call_user_func_array($func, array(2, 4)));

?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

int(8)

Beispiel #4 Passing values by reference

<?php

function mega(&$a){
$a = 55;
echo
"function mega \$a=$a\n";
}
$bar = 77;
call_user_func_array('mega',array(&$bar));
echo
"global \$bar=$bar\n";

?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

function mega $a=55
global $bar=55

Beispiel #5 call_user_func_array() using named arguments

<?php
function foobar($first, $second) {
echo
__FUNCTION__, " got $first and $second\n";
}

// Call the foobar() function with named arguments in non-positional order
call_user_func_array("foobar", array("second" => "two", "first" => "one"));

// Call the foobar() function with one named argument
call_user_func_array("foobar", array("foo", "second" => "bar"));

// Fatal error: Cannot use positional argument after named argument
call_user_func_array("foobar", array("first" => "one", "bar"));

?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

foobar got one and two
foobar got foo and bar

Fatal error: Uncaught Error: Cannot use positional argument after named argument

Anmerkungen

Hinweis:

Callbacks, die für Funktionen wie call_user_func() und call_user_func_array() registriert sind, werden nicht mehr ausgeführt, wenn in einem vorherigen Callback eine Exception geworfen und nicht gefangen wurde.

Siehe auch

add a note

User Contributed Notes 1 note

up
40
sebastian dot rapetti at tim dot it
3 years ago
Using PHP 8, call_user_func_array call callback function using named arguments if an array with keys is passed to $args parameter, if the array used has only values, arguments are passed positionally.

<?php

function test(string $param1, string $param2): void
{
echo
$param1.' '.$param2;
}

$args = ['hello', 'world'];
//hello world
call_user_func_array('test', $args);

$args = ['param2' => 'world', 'param1' => 'hello'];
//hello world
call_user_func_array('test', $args);

$args = ['unknown_param' => 'hello', 'param2' => 'world'];
//Fatal error: Uncaught Error: Unknown named parameter $unknown_param
call_user_func_array('test', $args);
?>
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