call_user_func_array

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

call_user_func_array — Call a callback with an array of parameters

Descrizione

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

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

Elenco dei parametri

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.

Valori restituiti

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

Log delle modifiche

Versione	Descrizione
8.0.0	`args` keys will now be interpreted as parameter names, instead of being silently ignored.

Esempi

Example #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"));
?>

Il precedente esempio visualizzerà qualcosa simile a:

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

Example #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'));

?>

Il precedente esempio visualizzerà qualcosa simile a:

Hello Hannes!
Hello Philip!

Example #3 Using lambda function

<?php

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

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

?>

Il precedente esempio visualizzerà:

int(8)

Example #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";

?>

Il precedente esempio visualizzerà:

function mega $a=55
global $bar=55

Example #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"));

?>

Il precedente esempio visualizzerà qualcosa simile a:

foobar got one and two
foobar got foo and bar

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

Note

Nota:
I callback registrati alle funzioni come call_user_func() e call_user_func_array() non saranno invocati se un'eccezione non gestita è trasmessa da un callback precedente.

Vedere anche:

call_user_func() - Call the callback given by the first parameter
ReflectionFunction::invokeArgs() - Invokes function args
ReflectionMethod::invokeArgs() - Invoke args

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User Contributed Notes 1 note

down

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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