How many times have you browsed to a particular page only to exit or close the browser before the page completely loads? Often such behavior is harmless.

Example :

ignore_user_abort = On

However, what if the server is in the midst of updating important user profile information, or completing a commercial transaction? Enabling ignore_user_abort causes the server to ignore session termination caused by a user- or browser-initiated interruption.

If enabled, the request will be allowed to complete even if the user aborts the request. Consider enabling it if executing long requests, which may end up being interrupted by the user or a browser timing out. PHP's default behavior is to disable this feature.