An Event Mediator that fits in a tweet

1-mediator.php

<?php

class M{function t($̀,$́){foreach(@$this->l[$̀]?:[]as$̃)$̃($́);}function a($̀,$́,$̃){$̂=&$this->l[$̀];while(@$̂[$̃])$̃.='a';$̂[$̃]=$́;krsort($̂,1);}}

2-usage.php

<?php
/*
Mediator can work with closures in PHP 5.3+
It can work with any valid callable in PHP 5.4+
*/

$mediator = new M();

/*
M#a() attaches a listener. Arguments:
- event name
- listener
- priority
*/
$mediator->a('hello_message_requested', function ($name) {
    echo 'Hello '.$name.'!';
}, 0);

/*
M#t() triggers an event. Arguments:
- event name
- event class (or plain data)
*/
$mediator->t('hello_message_requested', 'world'); // "Hello world!"

3-more-readable-version.php

<?php

class M
{
    function t($e, $a)
    {
        foreach (@$this->l[$e] ?: [] as $l)
            $l($a);   
    }
    
    function a($e, $l, $p)
    {
        $s = &$this->l[$e];
        while (@$s[$p])
            $p .= 'a';
            
        $s[$p] = $l;
        krsort($s, 1);
    }
}