[WP]WP Memory Limit

https://codex.wordpress.org/Editing_wp-config.php#Increasing_memory_allocated_to_PHP

 (code is at the beginning of /wp-includes/default-constants.php)

function wp_initial_constants() {
global $blog_id;
// set memory limits
if ( !defined('WP_MEMORY_LIMIT') ) {
if ( is_multisite() ) {
define('WP_MEMORY_LIMIT', '128M');
} else {
define('WP_MEMORY_LIMIT', '128M');
}
}