call_user_func_array

Call a callback with an array of parameters

mixed **call_user_func_array** callable $callback array $args

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

callback The to be called. callable

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

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


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


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

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

Voorbeeld: 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"));
?>

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

Voorbeeld: 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'));

?>

Hello Hannes!
Hello Philip!

Voorbeeld: Using lambda function

<?php

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

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

?>

int(8)

Voorbeeld: 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";

?>

function mega $a=55
global $bar=55

Voorbeeld: 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"));

?>

foobar got one and two
foobar got foo and bar

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

call_user_func``ReflectionFunction::invokeArgs``ReflectionMethod::invokeArgs

Volgende call_user_func →

call_user_func_array

call_user_func_array

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