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Request #49203 call_user_func_array when calling a parent constructor not from a user class
Submitted: 2009-08-10 03:57 UTC Modified: 2013-02-18 00:33 UTC
From: Assigned:
Status: No Feedback Package: Scripting Engine problem
PHP Version: 5.3.0 OS: Linux x86_64
Private report: No CVE-ID: None
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 [2009-08-10 03:57 UTC]
When using:

call_user_func_array(array('parent', '__construct'), $var);

This works if the parent is a user-defined class, but not if it's an extension-provided class (the extended constructor gets called twice).

This is not easy to explain, see attached reproduce code for more details.

My initial code was (in a class extending mysqli):

        private function __construct($params) {
                call_user_func_array(array('parent', '__construct'), $params);

Using this instead awfully fixes the problem:
parent::__construct($params[0], $params[1], $params[2], $params[3]);

Note that this wasn't possible in PHP 5.2.x

Warning: call_user_func_array(): First argument is expected to be a valid callback, 'parent::__construct' was given in foo.php on line 5

Reproduce code:

class B extends mysqli {
	public function __construct($var) {
		echo "here\n";
		call_user_func_array(array('parent', '__construct'), $var);

$x = new B(array('localhost', 'root'));

Expected result:

Actual result:

Warning: call_user_func_array() expects parameter 2 to be array, string given in foo.php on line 6


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 [2009-08-10 07:48 UTC]
The problem is not about internal classes, but classes not defining a __construct:

class A {

class B extends A {
    public function __construct() {
        echo "here\n";
        call_user_func(array('parent', '__construct'));

$x = new B;

seems like is_callable() returns true on array('parent', '__construct') and shouldn't.
 [2009-08-10 08:29 UTC]
Ok, mysqli's contructor is not named "__construct"

    Method [ <internal:mysqli, ctor> public method mysqli ] {

Still, one would expect that calling call_user_func_array(array('parent', '__construct'), ...) acts the same as parent::__construct(...) (which works). I guess somewhere the call to __construct must be redirected to the ctor...
 [2011-01-01 22:47 UTC]
-Status: Open +Status: Feedback -Package: Feature/Change Request +Package: Scripting Engine problem
 [2011-01-01 22:47 UTC]
What is the FR here? Re-type if this is actually a bug. And rewrite the summary, it isn't very informative. And update PHP version if this is still an issue.
 [2011-01-01 22:57 UTC]
Rather simple: if a given class's constructor is named with the class name (and 
not "__construct"), and is extended, then from the extending class:

- calling parent::__construct() will work
- calling call_user_func_array(array('parent', '__construct'), array()) won't

The behaviour would usually be assumed to be the same, but it is not.
 [2013-02-18 00:33 UTC] php-bugs at lists dot php dot net
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