how to increase php memory limit in wordpress

If you want to increase wordpress memory limit upto 64mb

Edit your wp-config.php file and put there

define( ‘WP_MEMORY_LIMIT’, ’64M’ );

And if you want to increase wordpress memory limit upto 128mb

edit your wp-config.php file and put there

define( ‘WP_MEMORY_LIMIT’, ‘128M’ );

and if you want to increase wordpress memory limit upto 256mb

define( ‘WP_MAX_MEMORY_LIMIT’, ‘256M’ );

Note: the developor must put this define memory constant before wordpress  database setting so it would work properly.