🔹 PHP Basic Flashcards

🔹 PHP Basic Flashcards – Set 1

🧾 Question	💡 Answer
What is PHP?	A server-side scripting language for web development.
Why is PHP used?	To build dynamic websites, handle forms, sessions, and databases.
Key features of PHP?	Open-source, server-side, platform-independent, supports databases.
echo vs print?	echo is faster; print returns 1 and can be used in expressions.
How to declare a variable?	Use $ symbol. Example: $name = "John";
PHP data types?	String, Integer, Float, Boolean, Array, Object, NULL.
== vs ===?	== checks value, === checks value + type.
What are superglobals?	Built-in variables like $_GET, $_POST, $_SESSION, etc.
GET vs POST method?	GET shows data in URL; POST hides data. POST is more secure.
include vs require?	require halts on error; include only gives a warning.

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🔹 Flashcards – Set 2

🧾 Question	💡 Answer
isset() vs empty()?	isset() checks if variable exists, empty() checks if it's empty.
Single vs Double Quotes?	'text' = literal, "text $var" = parses variable.
Define a constant?	define("SITE_NAME", "MySite");
Array types?	Indexed, Associative, Multidimensional.
Indexed vs Associative array?	Indexed uses numbers, associative uses keys.
Loop through an array?	Use foreach($arr as $val) or a for loop.
Loop types in PHP?	for, while, do...while, foreach.
Define a function?	function greet() { echo "Hi"; }
Handle errors in PHP?	Use error_reporting(), try-catch, or die()
Start a session?	Use session_start();

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🔹 Set 3 (Cookies, Sessions, Misc.)

🧾 Question	💡 Answer
Cookies vs Sessions?	Cookies = browser; Sessions = server (more secure).
Latest version of PHP?	You can say "PHP 8.x" depending on interview timing.
Write a simple PHP script?	<?php echo "Hello, world!"; ?>
Use of die() or exit()?	Stops the script with a custom message.