How to do a PHP hook system?

Question

How do you impliment a hook system in a PHP application to change the code before or after it executes. How would the basic architecture of a hookloader class be for a PHP

Answer 1

this solutions has some problems that you can't set several function for one callable hook. you can fallow this code.

 $action = [];

 function apply($hook, $args){
    global $action;
    $action[$hook]['args'] = $args;
    return doa($hook, $args);
 }

 function add($hook, $func){
    global $action;
    $action[$hook]['funcs'][] = $func;
 }

 function doa($hook,$args){
    global $action;
    if(isset($action[$hook]['funcs'])){
        foreach($action[$hook]['funcs'] as $k => $func){
            call_user_func_array($func, $args);
       }
    }
    
 }

 add('this_is', 'addOne');
function addOne($user){
    echo "this is test add one $user 
";
}
add('this_is', function(){
    echo 'this is test add two 
';
});


add('this_is_2', 'addTwo');
function addTwo($user, $name){
    echo $user . '   ' . $name . '
';
}


function test(){
    echo 'hello one 
';
    apply('this_is', ['user'=> 123]);
}


function test2(){
    echo 'hello two 
';
    apply('this_is_2', ['user'=> 123, 'name' => 'mohammad']);
}
test();
test2();