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