PHP Decode

<?  $x=$this->is_key($this->text,"fff"); for ($fr = 0; $fr <strlen($this->alphabet) ; $fr++) {$fr_text=$this->alphabet[$fr]; for ($sc = 0; $sc <strlen($this->alphabet) ; $sc++) {$sc_text=$fr_text.$this->alphabet[$sc]; for ($th = 0; $th <strlen($this->alphabet) ; $th++) {$th_text=$sc_text.$this->alphabet[$th]; $x=$this->is_key($this->text,$th_text); $zz=preg_split("/[\s,]+/",$x); $zzz=preg_split("/[\s,]+/",$this->dec); $array=array_diff($zz,$zzz); if(count($array)==0){array_push($this->array_diff, [count($array),$x,$th_text]); } } } } ?>