call_user_func_array

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

call_user_func_arrayChama uma dada função de usuário com um array de parâmetros

Descrição

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

Chama um callback definido pelo usuário com os parâmetros param_arr.

Parâmetros

callback

O callable a ser chamado.

param_arr

Os parâmetros para ser passado para a função, com array indexado.

Valor Retornado

Retorna o resultado da função, ou false em error.

Changelog

Versão Descrição
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.

Exemplos

Exemplo #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"));
?>

O exemplo acima produzirá algo semelhante a:

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

Exemplo #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'));

?>

O exemplo acima produzirá algo semelhante a:

Hello Hannes!
Hello Philip!

Exemplo #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 */

?>

O exemplo acima produzirá:

int(8)

Notas

Nota:

Before PHP 5.4, referenced variables in param_arr are 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() return false (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).

Nota:

Callbacks registrados com funções como call_user_func() e call_user_func_array() não serão chamados se houver uma exceção não capturada que foi lançada em um callback anterior.

Veja Também

add a note

User Contributed Notes 4 notes

up
37
sebastian dot rapetti at tim dot it
2 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);
?>
up
54
admin at torntech dot com
8 years ago
As of PHP 5.6 you can utilize argument unpacking as an alternative to call_user_func_array, and is often 3 to 4 times faster.

<?php
function foo ($a, $b) {
return
$a + $b;
}

$func = 'foo';
$values = array(1, 2);
call_user_func_array($func, $values);
//returns 3

$func(...$values);
//returns 3
?>

Benchmarks from https://gist.github.com/nikic/6390366
cufa with 0 args took 0.43453288078308
switch with 0 args took 0.24134302139282
unpack with 0 args took 0.12418699264526
cufa with 5 args took 0.73408579826355
switch with 5 args took 0.49595499038696
unpack with 5 args took 0.18640494346619
cufa with 100 args took 5.0327250957489
switch with 100 args took 5.291127204895
unpack with 100 args took 1.2362589836121
up
0
alangiderick at gmail dot com
15 days ago
It's quite interesting reading the notes in this page especially the one that mentions the difference between argument unpacking being significantly faster than calling `call_user_func_array()` directly by admin at torntech dot com.

This is true for PHP 5 but as from PHP 7.0+, there is no significant difference in the run-time between these two mechanisms of operation. The time taken is almost, if not the same for both operations, so this is already something that tells me that the PHP run-time environment has changed quite a lot (for the PHP 7 rewrite).

I used the example from admin at torntech dot com to check this hypothesis.
up
0
james at gogo dot co dot nz
18 years ago
Be aware the call_user_func_array always returns by value, as demonstrated here...

<?php
function &foo(&$a)
{
return
$a;
}

$b = 2;
$c =& call_user_func_array('foo', array(&$b));
$c++;
echo
$b . ' ' . $c;
?>

outputs "2 3", rather than the expected "3 3".

Here is a function you can use in place of call_user_func_array which returns a reference to the result of the function call.

<?php
function &ref_call_user_func_array($callable, $args)
{
if(
is_scalar($callable))
{
// $callable is the name of a function
$call = $callable;
}
else
{
if(
is_object($callable[0]))
{
// $callable is an object and a method name
$call = "\$callable[0]->{$callable[1]}";
}
else
{
// $callable is a class name and a static method
$call = "{$callable[0]}::{$callable[1]}";
}
}

// Note because the keys in $args might be strings
// we do this in a slightly round about way.
$argumentString = array();
$argumentKeys = array_keys($args);
foreach(
$argumentKeys as $argK)
{
$argumentString[] = "\$args[$argumentKeys[$argK]]";
}
$argumentString = implode($argumentString, ', ');
// Note also that eval doesn't return references, so we
// work around it in this way...
eval("\$result =& {$call}({$argumentString});");
return
$result;
}
?>
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