title: Joomla Fatal error: Allowed memory size after joomla update
body: <p>hi i am facing some error in my joomla site after update joomla version to 3.4 </p>
  
  <p>Server Info : </p>
  
  <p>Php 5.4.41</p>
  
  <p>MySQL 5.6.17</p>
  
  <h2>Apache 2.2.27</h2>
  
  <h2>Site Name : <a href="http://www.yousfis.com/" rel="nofollow">http://www.yousfis.com/</a></h2>
  
  <p>i enable display error by add these link in configuration.php</p>
  
  <p>ini_set( 'display_errors', true );
  error_reporting( E_ALL ); </p>
  
  <p>and facing these error in frontend </p>
  
  <p>Warning: preg_replace_callback(): Requires argument 2, '', to be a valid callback in /home/yousfisc/domains/yousfis.com/public_html/libraries/joomla/filter/input.php on line 988</p>
  
  <h2>Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 2474379033 bytes) in /home/yousfisc/domains/yousfis.com/public_html/libraries/joomla/filter/input.php on line 995</h2>
  
  <p>Please help me to solve this problem</p>