What are the potential causes of the fatal error when trying to allocate memory for image processing in PHP?

The fatal error when trying to allocate memory for image processing in PHP can be caused by insufficient memory_limit set in the php.ini configuration file. To solve this issue, you can increase the memory_limit value in the php.ini file or dynamically adjust it in your PHP script using the ini_set() function.

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