PHP intval() weird results

Question

I\'m encountering something weird and I don\'t know why it is happening!

I have a URL like:

http://mysite.com/users/USER_ID

this user id

Answer 1

The integer value of var on success, or 0 on failure. Empty arrays return 0, non-empty arrays return 1. (From php.net intval().)

intval('abcdefg') will trigger an error and the function return with 0.