How to increase PHP memory limit?
To increase PHP memory limit, Open your wp-config.php file and add the following code, see image for more information. We suggest that you should set memory limit to 256MB instead of 128MB.
define( 'WP_MEMORY_LIMIT', '256M' );
Note: If it is not working then please contact your host to increase the PHP memory limit for you. Some hosting provide Memory settings in cPanel also.
