call back function with $this
Question by v0idless
I am trying to use an instance method as a callback for PHP 5.2.1. I am aware that as of PHP 5.4 you can use $this inside a closure, and in PHP 5.3 you can rename $this to $self and pass that to the closure. However, neither of these methods will suffice since I need this to work for PHP 5.2.1. The two commented lines was my last attempt. That results in Fatal error: Call to a member function hello() on a non-object – is there anyway I can have a callback to an instance method in PHP 5.2.1?
<?php
class Test {
public function __construct() {
$self = &$this;
$cb = function() use ( $self ) {
$self->hello();
};
call_user_func( $cb );
// $cb = create_function( '$self', '$self->hello();' );
// call_user_func( $cb );
}
public function hello() {
echo "Hello, World!n";
}
}
$t = new Test();
Answer by Rocket Hazmat
$cb = create_function('$self', '$self->hello();');
This is just making a function that can take a parameter called $self. It’s the same as this:
function test($self){
$self->hello();
}
You can try passing $self (or $this) to the function when you call it:
call_user_func($cb, $this);
You can also try to make $self a global variable, so that the anonymous function made by create_function can read it.
$GLOBALS['mySelf'] = $self;
$cb = create_function('', 'global $mySelf; $mySelf->hello();');
call_user_func($cb);
// You may want to unset this when done
unset($GLOBALS['mySelf']);
Answer by Starx
How about SIMPLICITY?
class Test {
public function __construct() {
$this -> funcName($this);
}
public function funcName($obj) {
$obj->hello();
}
public function hello() {
echo "Hello, World!n";
}
}
Update: Just tested the codes. They are working fine using this.
call_user_func_array(array($self, "hello"), array());
