Online PHP editor | output for 1jU5L

<?php $used = ['passman.dev', 'clouddataservice.dev', 'imgoingforaride.dev', 'verbalarts.dev', 'auth.verbal.dev', 'exclaim-crm-internal.dev', 'exclaim-crm-patient.dev', 'felix.dev', 'stopsmokingnhs.dev', 'myvoice.dev', 'learningfirstcontact.dev', 'dibi.dev', 'heartburn.dev', 'letstalknewcastle.dev', 'escape.dev', 'sotw.keep-it-clear.dev', 'livewell.dev', 'upublish.dev', 'sevengate.dev', 'honest-ulsterman.dev', 'digitalportfolio.dev']; $avail = ["auth.verbal.dev", "lagan.dev", "clouddataservice.dev", "learningfirstcontact.dev", "cpi-intranet.dev", "letstalknewcastle.dev", "dibi.dev", "livewell.dev", "digitalportfolio.dev", "migraine-action.dev", "escape.dev", "myvoice.dev", "exclaim-crm-internal.dev", "necn.nhs.co.uk", "exclaim-crm-patient.dev", "passman.dev", "felix.dev", "garrattbusinesspark.dev", "pyrocms.dev", "heartburn.dev", "roadrespect.org", "heartburnentertainment.dev", "sevengate.dev", "honest-ulsterman.dev", "stopsmokingnhs.dev", "idiotisachoice.dev", "twitteroauth.dev", "imgoingforaride.dev", "upublish.dev", "keep-it-clear.dev", "verbalarts.dev", "kingstonaviation.dev", "youfilmyourown.dev"]; $del = []; foreach ($avail as $dir) { if (!in_array($dir, $used)) { $del[] = $dir; } } print "rm -fr " . implode(' ', $del) . PHP_EOL;