title: Search IN and create new array
body: <p>I have a foreach wich return data like below:</p>
  
  <pre><code>foreach($array_users as $key =&gt; $item) {
      $dwn_users = array();
  $dwn_users = "USER_ID ". $item['user_id'] . " USER_ROOMS " . base64_decode($item['user_rooms']);
  }
  </code></pre>
  
  <p>print_r($dwn_users);</p>
  
  <pre><code>        USER_ID 2 USER_ROOMS a:8:{i:0;s:2:"49";i:1;s:2:"60";i:2;s:2:"69";i:3;s:2:"65";i:4;s:2:"66";i:5;s:2:"59";i:6;s:2:"71";i:7;s:2:"57";}
          USER_ID 3 USER_ROOMS a:1:{i:0;s:2:"49";}
          USER_ID 4 USER_ROOMS a:4:{i:0;s:2:"49";i:1;s:2:"60";i:2;s:2:"65";i:3;s:2:"58";}
  </code></pre>
  
  <p>I'm like to create new array with list of USER_ID with access to certain room example:
  $room = '60';</p>
  
  <p>How to search IN $dwn_users for room 60 and create new array of user ID?
  In this case an array with USER_ID 2 and USER_ID 4</p>