Online PHP editor | output for cHHNV

<?php $first = <<<CWS [ {"id":2, "first_name":"Felicdad", "last_name":"Vasile", "email":"fvasile1@unesco.org"}, {"id":2, "first_name":"Any", "last_name":"User", "email":"someone@foobar.com"}, {"id":3, "first_name":"Anni", "last_name":"Meineken", "email":"ameineken2@google.com.br"} ] CWS; $second = <<<CWS [ {"id":998, "first_name":"Sherri", "last_name":"Millen", "email":"smillenrp@spiegel.de"}, {"id":2, "first_name":"Felicdad", "last_name":"Vasile", "email":"fvasile1@unesco.org"}, {"id":999, "first_name":"Seth", "last_name":"Spaducci", "email":"sspaduccirq@irs.gov"}, {"id":124, "first_name":"Anni", "last_name":"Meineken", "email":"ameineken2@google.com.br"} ] CWS; $users_one = json_decode($first, true); $users_two = json_decode($second, true); $mails_one = array_column($users_one, 'email'); $mails_two = array_column($users_two, 'email'); $diff = array_intersect($mails_one, $mails_two); foreach($diff as $id => $mail) { $matches[] = $users_one[$id]; } print_r($matches);