Beginner LevelPHP 8+
What are PHP Superglobal arrays ($_GET, $_POST, $_SERVER, $_SESSION, $_COOKIE) and how do they work?
❓ Interview Prompt: Explain built-in PHP superglobal arrays, global scope availability, and inspecting HTTP request data.
Superglobals are built-in associative arrays in PHP that are automatically accessible from anywhere in a script (inside functions, methods, or global scope) without needing the 'global' keyword.
Common Superglobals:
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'$_GET': Contains HTTP GET URL query parameters ('/page.php?id=42').
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'$_POST': Contains HTTP POST form submission body data.
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'$_SERVER': Contains web server headers, request paths, client IP addresses, and script metadata.
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'$_SESSION': Stores persistent session data across HTTP requests for a user.
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'$_COOKIE': Contains HTTP cookies sent by the client browser.
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'$_FILES': Contains uploaded file metadata and temporary storage paths.
Code Implementation Example
php
<?php
// Inspecting HTTP request headers and methods via $_SERVER
$requestMethod = $_SERVER['REQUEST_METHOD'];
$userAgent = $_SERVER['HTTP_USER_AGENT'];
if ($requestMethod === 'POST') {
// Access submitted form parameters securely
$username = htmlspecialchars($_POST['username'] ?? '');
echo "Processing POST request for $username";
}💡Inspecting HTTP request metadata and form data using $_SERVER and $_POST.
🎯 Interview Key Takeaway
Superglobals ($_GET, $_POST, $_SERVER, $_SESSION) are built-in arrays accessible everywhere in PHP without global keywords.
#Superglobals#$_GET#$_POST#$_SERVER#Beginner
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