What could be causing the "Allowed memory size exhausted" error in PHP, and how can it be resolved?

The "Allowed memory size exhausted" error in PHP occurs when a script tries to allocate more memory than the limit set in the php.ini configuration file. This can happen due to inefficient code, large data processing, or recursive functions. To resolve this issue, you can increase the memory limit in the php.ini file or optimize your code to use memory more efficiently.

// Increase memory limit in PHP script
ini_set('memory_limit', '256M');