PHP code example of lastguest / ev

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

lastguest / ev example snippets

function ∑($n,$c=0){static$r;is_callable($c)?$r[$n][]=$c:@array_walk($r[$n],'call_user_func',$c?:[]);}

// Bind callback to event "init"
∑('init', function(){
    echo "Init event triggered!\n";
});

// Bind another callback to event "init"
∑('init', function(){
    echo "Second handler for init triggered!\n";
});

// Bind callback to event "debug.event" and listen to passed parameters
∑('debug.event', function($idx,$params){
    echo "Called debug.event[$idx] with parameters : ",print_r($params,true),"\n";
});

// Trigger `init`
∑("init");

// Trigger `debug.event` passing parameters
∑('debug.event',[1,2,'Hello, Friend.']);

function ∑ ($event_name, $callback=null){
    // The event handlers repository.
    static $event_handlers;
 
    if (is_callable($callback)) {

        // We are binding a callback to an event, add $callback to the
        // events handler repository.
        $event_handlers[$event_name][] = $callback;

    } else {

        // When $callback is not a callable, then we are triggering the event.
        // In this case, $callback will be our array of parameters to pass to event handlers 
        $params = $callback ? $callback : [];

        // Walk all handlers binded to event $event_name and invoke them with the
        // ($event_index, $params) parameters.
        array_walk($event_handlers[$event_name],'call_user_func',$params);
    }
}