Checking if request is post back in PHP
52972
Detecting request type in PHP (GET, POST, PUT or DELETE)
7951
PHP IF OR Else statement - best way to do this
53543
PHP POST not working
89873
PHP: a short cut for isset and !empty?
25703
Best way to test for a variable's existence in PHP; isset() is clearly broken
117180
Confirmation on submit
107030
How do I read any request header in PHP
97577
(PHP) Is handling a form submission on the same page more/less/equally good as handling on a separate page?
155827
How can I run a PHP script in the background after a form is submitted?
133871
How do I implement a callback in PHP?
4120
Read Post Data submitted to ASP.Net Form
123902
prevent form from POSTing until javascript code is satisfied
145063
How to detect when a user has successfully finished downloading a file in php
16899
$post->ID not working
34284
Intercepting call to the back button in my AJAX application
126200
How can I tell which button was clicked in a PHP form submit?
69201
How do you force a web browser to use POST when getting a url?