Add forms handling documentation in PHP

data/basics/control.md

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+# Control Flow
+
+Used for conditions and loops.
+
+## Example
+```php
+<?php
+for($i = 1; $i <= 5; $i++) {
+    echo $i;
+}
+?>
+Practice
+
+Print numbers from 1 to 10.

data/basics/datatypes.md

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+# Data Types in PHP
+
+- int → integers  
+- float → decimals  
+- string → text  
+- bool → true/false  
+
+## Example
+```php
+<?php
+$age = 25;
+$price = 9.99;
+$name = "John";
+$isActive = true;
+?>
+Practice
+
+Create variables of each type.

data/basics/functions/advanced/arrays.md

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+# Arrays in PHP
+
+Arrays store multiple values.
+
+## Example
+```php
+<?php
+$arr = array(1,2,3);
+echo $arr[0];
+?>
+Practice
+
+Create an array and print elements.

data/basics/functions/advanced/error handling.md

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+# Error Handling
+
+Handles runtime errors.
+
+## Example
+```php
+<?php
+try {
+    throw new Exception("Error");
+} catch(Exception $e) {
+    echo $e->getMessage();
+}
+?>
+Practice
+
+Handle an exception.

data/basics/functions/advanced/ffile handling.md

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+# File Handling
+
+Read and write files.
+
+## Example
+```php
+<?php
+file_put_contents("file.txt", "Hello");
+?>
+Practice
+
+Write text to a file.

data/basics/functions/advanced/oop.md

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+# Object-Oriented Programming
+
+Use classes and objects.
+
+## Example
+```php
+<?php
+class Car {
+    public $name;
+}
+?>
+Practice
+
+Create a class with properties.

data/basics/functions/advanced/sessions and cookies.md

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+# Sessions and Cookies
+
+Used to store user data.
+
+## Example
+```php
+<?php
+session_start();
+$_SESSION["user"] = "Ali";
+?>
+Practice
+
+Store a value in session.

data/basics/functions/built in functions.md

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+# Built-in Functions
+
+PHP provides many built-in functions.
+
+## Example
+```php
+<?php
+echo strlen("Hello");
+?>
+Practice
+
+Use a built-in function to count string length.

data/basics/functions/functions.md

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+# Functions in PHP
+
+Functions are reusable blocks of code.
+
+## Example
+```php
+<?php
+function greet() {
+    echo "Hello!";
+}
+?>
+Practice
+
+Create a function that prints your name.

data/basics/functions/parameters.md

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+# Parameters
+
+Functions can take arguments.
+
+## Example
+```php
+<?php
+function greet($name) {
+    echo $name;
+}
+?>
+Practice
+
+Create a function that takes two numbers and prints sum.

data/basics/functions/recursion.md

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+# Recursion
+
+Function calling itself.
+
+## Example
+```php
+<?php
+function factorial($n) {
+    if($n == 0) return 1;
+    return $n * factorial($n - 1);
+}
+?>
+Practice
+
+Write recursive sum function.

data/basics/functions/return values.md

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+# Return Values
+
+Functions can return values.
+
+## Example
+```php
+<?php
+function add($a, $b) {
+    return $a + $b;
+}
+?>
+Practice
+
+Create a function that returns square of a number.

data/basics/introduction.md

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+# Introduction to PHP
+
+PHP is a server-side scripting language used for web development.
+
+## Example
+```php
+<?php
+echo "Hello, PHP!";
+?>
+Practice
+
+Print "Welcome to PHP Programming"

data/basics/operations.md

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+# Operators in PHP
+
+- Arithmetic: +, -, *, /  
+- Comparison: ==, !=  
+- Logical: &&, ||  
+
+## Example
+```php
+<?php
+$a = 5;
+$b = 3;
+echo $a + $b;
+?>
+Practice
+
+Check if a number is even or odd.

data/basics/variables.md

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+# Variables in PHP
+
+Variables start with $ symbol.
+
+## Example
+```php
+<?php
+$name = "Ali";
+$age = 20;
+?>
+Practice
+
+Create variables for your name and age.