(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
call_user_func_array — Call a callback with an array of parameters
Calls the callback given by the first parameter with the parameters in args.
callbackThe callable to be called.
argsThe 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.
Returns the return value of the callback, or false on error.
| Versão | Descrição |
|---|---|
| 8.0.0 | args keys will now be interpreted as parameter names, instead of being silently ignored. |
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";
}
}
call_user_func_array(__NAMESPACE__ .'\Foo::test', array('Hannes'));
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)));
?>O exemplo acima produzirá:
int(8)
Exemplo #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";
?>O exemplo acima produzirá:
function mega $a=55 global $bar=55
Exemplo #5 call_user_func_array() using named arguments
<?php
function foobar($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"));
?>O exemplo acima produzirá algo semelhante a:
foobar got one and two foobar got foo and bar Fatal error: Uncaught Error: Cannot use positional argument after named argument
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.