php basics0203233323333333333333333333333333

php basics

1. PHP Basics Introduction to PHP Programming Presented by: Shahabaj Khan

2. Introduction to PHP • What is PHP? - PHP: Hypertext Preprocessor - Server-side scripting language - Widely used for web development • Why use PHP? - Easy to learn - Open-source - Cross-platform

3. PHP Syntax Overview • Basic Structure: <?php // PHP code goes here ?> • PHP Tags: - Opening tag: <?php - Closing tag: ?>

4. Variables in PHP $variable_name = value; Example: $name = "John"; $age = 25; Variables start with $, are case-sensitive, and do not require explicit type declaration.

5. Data Types in PHP Common Data Types: • String • Integer • Float • Boolean • Array • Object

6. PHP Operators Types of Operators: • Arithmetic: +, -, *, / • Assignment: =, +=, -= • Comparison: ==, !=, >, < • Logical: &&, ||, !

7. Control Structures in PHP Conditional Statements: if (condition) { // code to execute if true } elseif (condition) { // code for elseif } else { // code to execute if false } Loops: • while • for • foreach

8. Functions in PHP Definition: function functionName() { // code to execute } Example: function sayHello() { echo "Hello, World!"; }

9. Working with Forms in PHP HTML Form Example: <form method="POST" action="submit.php"> Name: <input type="text" name="name"> <input type="submit"> </form> PHP Script to Handle Form: $name = $_POST["name"]; echo "Hello, " . $name;

10. File Handling in PHP Basic Operations: • fopen(), fread(), fwrite(), fclose() Example: $file = fopen("test.txt", "r"); echo fread($file, filesize("test.txt")); fclose($file);

11. PHP and MySQL Connecting to a Database: $conn = mysqli_connect("hostname", "username", "password", "database"); if (!$conn) { die("Connection failed: " . mysqli_connect_error()); }