What is the difference between normal variables and variables passed via URL or POST in PHP?

Normal variables in PHP are variables that are declared and assigned a value within the PHP script itself. Variables passed via URL or POST are variables that are sent from an external source, such as a form submission or a URL query string. To access variables passed via URL or POST, you need to use the `$_GET` or `$_POST` superglobals, respectively. It is important to sanitize and validate these variables to prevent security vulnerabilities. 

// Example of accessing a variable passed via URL
$variable = $_GET['variable_name'];

// Example of accessing a variable passed via POST
$variable = $_POST['variable_name'];

Keywords

variables URL POST PHP difference

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