title: PHP/MySQL: how to access an array value from a mysql field
body: <p>I have a field value  in a mySQL table that I save into a variable called "$mp3".</p>
  
  <p>If I echo this variable, I get this:</p>
  
  <pre><code>a:3:{s:4:"file";s:114:"/home/www/xxxxx/web/admin/wp-content/uploads/2014/05/table3_podcast_20141.mp3";s:3:"url";s:92:"http://www.xxxx.com/admin/wp-content/uploads/2014/05/table3_podcast_20141.mp3";s:5:"error";b:0;}
  </code></pre>
  
  <p>How should I complete my variable in order to only retrieve this part of the array (whatever its content):</p>
  
  <pre><code>http://www.xxxx.com/admin/wp-content/uploads/2014/05/table3_podcast_20141.mp3
  </code></pre>
  
  <p>Thank you!</p>