Yesterday I wrote a WordPress Login Notification Plugin. And I use Anonymous Function (introduced in PHP 5.3) in the settings. It work well in my server but when I install it in my client site, the settings page is truncated even though my client use PHP 5.3.
After some googling, I found that we cannot use $this in anonymous function in PHP 5.3, we can use that only in PHP 5.4 +. Thank god I didn’t get fatal error 🙂
How to solve this?
/**
* Only in PHP 5.4
* Cannot do this in PHP 5.3
*/
class my_Class_Something{
public $my_var = 'my_var';
public function __construct(){
add_action(
'some_hook',
function(){
return $this->my_var;
}
);
}
}Well, actually we still can’t use $this (directly in anonymous function), but we can do something like this:
/**
* PHP 5.3 Workaround
*/
class my_Class_Something{
public $my_var = 'my_var';
public function __construct(){
$var = $this->my_var;
add_action(
'some_hook',
function() use( $var ){
return $var;
}
);
}
}note: in the end, i decided to not use anonymous function at all. so the plugin is PHP 5.2 compatible 🙂