How can I delete an image when a user leaves my site in php? [closed]

How can I delete an image when a user leaves my site in php? [closed]

References

Reference NO 1

http://stackoverflow.com/questions/13658564/how-can-i-delete-an-image-when-a-user-leaves-my-site-in-php

Reference NO 2

http://stackoverflow.com/questions/17674376/how-can-i-delete-a-picture-if-the-user-is-changing-the-current-page

Reference NO 3

http://wordpress.org/support/topic/266489

Reference NO 4

http://php.net/

Reference NO 5

http://www.hotscripts.com/category/scripts/php/scripts-programs/image-galleries/page:4/

Reference NO 6

http://wordpress.stackexchange.com/questions/1567/best-collection-of-code-for-your-functions-php-file

Reference NO 7

http://www.htmlgoodies.com/beyond/javascript/article.php/3881826

Reference NO 8

http://www.sitepoint.com/php-sessions/