(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
.
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
.
Returns the return value of the callback, or false
on error.
Version | Description |
---|---|
8.0.0 |
args keys will now be interpreted as parameter names, instead of being silently ignored.
|
Example #1 call_user_func_array() example
<?phpfunction 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 argumentscall_user_func_array("foobar", array("one", "two"));// Call the $foo->bar() method with 2 arguments$foo = new foo;call_user_func_array(array($foo, "bar"), array("three", "four"));?>
The above example will output something similar to:
foobar got one and two foo::bar got three and four
Example #2 call_user_func_array() using namespace name
<?phpnamespace Foobar;class Foo { static public function test($name) { print "Hello {$name}!\n"; }}call_user_func_array(__NAMESPACE__ .'\Foo::test', array('Hannes'));call_user_func_array(array(__NAMESPACE__ .'\Foo', 'test'), array('Philip'));?>
The above example will output something similar to:
Hello Hannes! Hello Philip!
Example #3 Using lambda function
<?php$func = function($arg1, $arg2) { return $arg1 * $arg2;};var_dump(call_user_func_array($func, array(2, 4)));?>
The above example will output:
int(8)
Example #4 Passing values by reference
<?phpfunction mega(&$a){ $a = 55; echo "function mega \$a=$a\n";}$bar = 77;call_user_func_array('mega',array(&$bar));echo "global \$bar=$bar\n";?>
The above example will output:
function mega $a=55 global $bar=55
Example #5 call_user_func_array() using named arguments
<?phpfunction foobar($first, $second) { echo __FUNCTION__, " got $first and $second\n";}// Call the foobar() function with named arguments in non-positional ordercall_user_func_array("foobar", array("second" => "two", "first" => "one"));// Call the foobar() function with one named argumentcall_user_func_array("foobar", array("foo", "second" => "bar"));// Fatal error: Cannot use positional argument after named argumentcall_user_func_array("foobar", array("first" => "one", "bar"));?>
The above example will output something similar to:
foobar got one and two foobar got foo and bar Fatal error: Uncaught Error: Cannot use positional argument after named argument
Note:
Callbacks registered with functions such as call_user_func() and call_user_func_array() will not be called if there is an uncaught exception thrown in a previous callback.