php_function
implement functions with PHP
In cookies_session folder, the .php documents are used to implement cookies and sessions seperately.
In form_data folder:
form.php & form_processing.php are used to implement page-to-page transfer data.
form_singlepage.php is for single page transfer data.
form_single_validation.php is the most functional php form integrated other files function.
form_validation_error.php is for dealing with data error.
validation_function.php is a php file for validating data only.
In url_link folder: dealing with simple url with PHP