PHP Form

Hypertext Preprocessor

Preprocessor Hypertext

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Programming Hypertext Pages

Portable Hypertext Processor

$_GET

$_POST

$_REQUEST

$_COOKIE

$_SESSION

HTML or JavaScript injection

SQL injection

Cross-site request forgery (CSRF)

Password brute forcing

Data leakage in browser history

htmlspecialchars()

htmlentities()

strip_tags()

urlencode()

addslashes()

POST

GET

PUT

DELETE

CONNECT

GET appends data to the URL, while POST sends data in the HTTP body.

GET is more secure than POST for sending sensitive data.

POST does not append data to the URL.

GET is limited by URL length, POST is not.

GET requests can be bookmarked, POST requests cannot.

To collect values from both GET and POST methods

To manage session data

To track cookies

To access files uploaded through forms

To store form validation errors

Specifies where to send the form data upon submission

Specifies the HTTP method to use (GET or POST)

Specifies the input elements to include in the form

Specifies the type of encoding for the form data

Specifies the server to receive the form data

Converts special HTML characters to prevent XSS attacks

Encrypts form data

Strips HTML tags from the input

Validates form input for correctness

Converts form data into JSON format

It submits data in the HTTP message body.

It appends data to the URL.

It is limited to ASCII characters only.

It stores parameters in browser history.

It is always visible to everyone in the URL.