different types of errors in php
1. Notices:
non-critical errors,not displayed to window, for example: variable is not def ind,do not affect the program.
2. Warnings:
serious errors -it displayed to window for example: include() a file which does not found, at the time these errors displayed, but they do not affect the script.
3. Fatal errors:
These are critical errors, affect termination of the script, - for example, instantiating an object of a non-existent class, or calling a non-existent function.
