Replacing ereg() with preg_match() in PHP
After upgrading PHP, some scripts such as those used in old Drupal systems may report the fatal error "undefined function ereg()" due to the function's deprecation and removal. Simply replace it with preg_match() to solve the problem.
1. Find the ereg() function.
ereg($pattern, $subject, $matches);
2. Convert it to the preg_match() function as shown.
preg_match("/".$pattern."/", $subject, $matches);