A very simple PHP chat on 1 instruction (no loop, no closure, no control structure)

gistfile1.php

<?php ($_='[["accueil","messages","contact","vider"],["Menu","Votre message","d/m/Y H:i:s","message","Envoyer","Me Contacter","benjamin.delespierre@gmail.com","chat.log","Fichier supprim&eacute;","Messages"]]') &&($_GET+=['p'=>null]) &&in_array($p = $_GET['p'], (($j=json_decode($_,true))&&($s=$j[0])&&($w=$j[1])) ? $s : array()) ?($s[0]==$p &&array_shift($s) &&print('<h1>'.$w[0].'</h1><ul><li>'.implode('</li><li>',array_map('sprintf',array_fill(0, count($s), '<a href="?p=%s">%s</a>'),$s,$s))))||($r=sprintf('<a href="?p=%s">%s</a>',$s[0],$s[0])) &&(($s[1]==$p &&vprintf('<h1>%s</h1>%s<hr/>%s<hr/>'.$r,array($w[3],sprintf('<form action="?p=%s" method="post"><input name="n" placeholder="%s"><button type="submit">%s</button></form>',$p,$w[1],$w[4]),((isset($_POST['n']) &&($h = fopen($w[7],'a+')) &&fwrite($h, date($w[2]).": {$_POST['n']}\n")) ? '' : '').'<p>'. implode('</p><p>',is_file($w[7]) ? array_reverse(file($w[7])) : array()). '</p>')))||($s[2]==$p &&printf('<p><a href="mailto:%s">%s</a></p>'.$r,$w[6],$w[5]))||($s[3]==$p &&(is_file($w[7]) ?unlink($w[7]) && print("<p>{$w[8]}</p>{$r}") :print($r)))): header("Location: ?p={$s[0]}") ?>