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PHP Form Handling and Validation | PHP Tutorial

Main objective of PHP and HTML form controls are to collect data from users.
Basic HTML Form Controls The following control types are available in HTML form controlling:
● Text inputs
● Buttons
● Checkbox
● Radio box
● File Select
● Form Tag

PHP Basic Form Handling

When the user keying the input data in HTML controls and clicks the submit button the request will be generated and reaches a PHP file which is mentioned in the FORM tag under the Action attribute.
All input values are synchronized and sent to the server via POST method or GET method.
Once the data reaches the server, two PHP variables such as $_POST and $_GET collects the data and prepares the response accordingly.
Post Method: The input data sent to the server with POST method is stored in the request body of the client’s HTTP request.
Get Method: The input data sent to the server with POST method via URL address is known as query string. All input data are visible by user after they clicks the submit button.

Basic PHP Form Validation

Validation is a process of checking the input data submitted by the user from client machine. There are two types
Client-Side Validation
Server Side Validation


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