Expected to be a reference ошибка

Solution 1

call_user_func can only pass parameters by value, not by reference. If you want to pass by reference, you need to call the function directly, or use call_user_func_array, which accepts references (however this may not work in PHP 5.3 and beyond, depending on what part of the manual look at).

Solution 2

From the manual for call_user_func()

Note that the parameters for call_user_func() are not passed by reference.

So yea, there is your answer. However, there is a way around it, again reading through the manual

call_user_func_array('test', array(&$b));

Should be able to pass it by reference.

Solution 3

I’ve just had the same problem, changing (in my case):

$result = call_user_func($this->_eventHandler[$handlerName][$i], $this, $event);

to

$result = call_user_func($this->_eventHandler[$handlerName][$i], &$this, &$event);

seem to work just fine in php 5.3.

It’s not even a workaround I think, it’s just doing what is told

$b = call_user_func('test', $b);

function test($a) {
    ...
    return $a
}

Answer by Tadeo Hudson

Meta Stack Overflow

,

possible duplicate of Warning: mysql_fetch_* expects parameter 1 to be resource, boolean given error

– John Conde

Jul 28 ’12 at 16:39

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Check the function signature of Some_Function_name(), you probably have something like:

function Some_Function_name(&$param1)
{
    // ...

Answer by Maren Preston

Support » Fixing WordPress » Warning: Parameter 1 to wp_default_scripts() expected to be a reference,The topic ‘Warning: Parameter 1 to wp_default_scripts() expected to be a reference’ is closed to new replies.,Warning: Parameter 1 to wp_default_styles() expected to be a reference, value given in /nas/content/staging/stgsborg/wp-includes/class-wp-hook.php on line 286,Warning: Parameter 1 to wp_default_scripts() expected to be a reference, value given in /nas/content/staging/stgsborg/wp-includes/class-wp-hook.php on line 286

Just to add, I had to change another line in the same file referenced above by @mucha, around line 926 I had another instance of the ..( &$scripts ). So change:
function wp_default_styles( &$styles ) {}
becomes:
function wp_default_styles( $styles ) {}

function wp_default_styles( &$styles ) {}

Just to add, I had to change another line in the same file referenced above by @mucha, around line 926 I had another instance of the ..( &$scripts ). So change:
function wp_default_styles( &$styles ) {}
becomes:
function wp_default_styles( $styles ) {}

function wp_default_styles( $styles ) {}

Answer by Joaquin Jennings

This is a PHP 5.3 compatibility issue. You could remove the reference operator & from the argument $param1. Or you could rollback to PHP 5.2.x if absolutely necessary.,If you find copyright violations, you can contact us at info-generacodice.com to request the removal of the content.,The Contents are licensed under creative commons.,Check the function signature of Some_Function_name(), you probably have something like:

I am «familiar» with PHP and my friend had his site broken with error:

Warning: Parameter 1 to Some_function_name() expected to be a reference, 
value given in /.../public_html/includes/tng/tNG.class.php on line 219

line 219:

$ret = call_user_func_array($callBackFunction,$tempParam);

Answer by Thea Palmer

If you do NOT use a $this reference, then PHP 7.2.3 without UOPZ will return warnings:
PHP Warning: Parameter 1 to myfunction() expected to be a reference, value given.,@mszabo-wikia Confirmed with PHP 7.2.3. Without UOPZ extension, ONLY this code (using &$this) will work and NO issue warnings:,At this point, we suspect that UOPZ could be exposing a bug within Zend, but don’t have a definitive example that proves it.,@ASchmidt1 Are you sure you are not running afoul of the changed handling of $this in PHP 7.1 and above?

<?php
declare(strict_types=1);

function myfunction( &$anobject ) { return 'success'; }

function callmyfunction( $args ) { 
    var_dump( call_user_func_array( 'myfunction', $args ) .'2' ); // fails!
    var_dump( call_user_func_array( 'myfunction', array( &$args[0] ) ) .'3'); //circumvention
}

class MyClass 
{
    function __construct() {
        var_dump( call_user_func_array( 'myfunction', array( &$this ) ) .'1' ); //works
        callmyfunction( array( &$this ) ); // loses array-embedded reference!
    }
}
$myobject = new MyClass;

Answer by Wells Kennedy

I get the mentioned error when i enable Google Analytics module. I believe the problem is PHP5.3.1 which i have running the website.,however, I do NOT have GoogleAnalytics module installed!,Repro is easy:
1. Set up drupal on a site running PHP 5.3
2. Enable Google Analytics module.,I’m not running Google Analytics or WYSIWYG and still get the error:

If you want to call all load_profile() «hooks», you need to use a custom foreach loop with module_implements:

$hook = 'profile_load';
$profile_fields = array();
foreach (module_implements($hook) as $module) {
  $function = $module . '_' . $hook;
  $profile_fields = array_merge($profile_fields, $function($user));
}

Answer by Kamden Patterson

I am «familiar» with PHP and my friend had his site broken with error:,Check the function signature of Some_Function_name(), you probably have something like:,Care must be taken when using mysqli_stmt_bind_param() in conjunction with call_user_func_array(). Note that mysqli_stmt_bind_param() requires parameters to be passed by reference, whereas call_user_func_array() can accept as a parameter a list of variables that can represent references or values.,This is a PHP 5.3 compatibility issue. You could remove the reference operator & from the argument $param1. Or you could rollback to PHP 5.2.x if absolutely necessary.

I am «familiar» with PHP and my friend had his site broken with error:

Warning: Parameter 1 to Some_function_name() expected to be a reference, 
value given in /.../public_html/includes/tng/tNG.class.php on line 219

line 219:

$ret = call_user_func_array($callBackFunction,$tempParam);

Answer by Orlando Foley

Warning: Parameter 1 to wp_default_scripts() expected to be a reference, value given in /wp-includes/class-wp-hook.php on line 286,Warning: Parameter 1 to wp_default_styles() expected to be a reference, value given in /wp-includes/class-wp-hook.php on line 286,#custom heartbeat — stop the warning from WPE
# see https://www.thetwopercent.co.uk/solved-warning-parameter-1-to-wp_default_scripts/
define( ‘WPE_HEARTBEAT_INTERVAL’, 15 );,This error is caused because WP Engine turn off the WordPress heartbeat on Admin pages that are not editable.

Are you seeing a warning message in WordPress admin via Query Monitor?

Warning: Parameter 1 to wp_default_scripts() expected to be a reference, value given in /wp-includes/class-wp-hook.php on line 286

Warning: Parameter 1 to wp_default_scripts() expected to be a reference, value given in /wp-includes/class-wp-hook.php on line 286

Answer by Cora Fletcher

Warning: Parameter 1 to monographs_node_check() expected to be a reference, value given in menu_execute_active_handler() (line 517 of …public_htmlincludesmenu.inc).,The problem occurs because Drupal uses call_user_func_array() in order to invoke the menu callback function and pass the parameters to it.,
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,I got the answer from the support list, and all I needed to do was remove the reference for the node object in my callback function signature:

I got the answer from the support list, and all I needed to do was remove the reference for the node object in my callback function signature:

function monographs_node_check($node, $type)