This is an error 404
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144.58 ms | 1399 KiB | 7 Q<?php
$ar = array("re" => 12, "er" => 44, "rt" => array('rt' => 55,'tt' => 66) );
$er = $ar['ss'] ?: null;
$re = $er ?: $ar['re'] ? $ar['rt'] : $ar['rt']['rt'];
print_r($re);