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Web Development PHP CRUD Operations
Study Notes with Explanations
PHP CRUD operations using mysqli (Create, Read, Update, Delete), which is a common topic in web development courses.
Created by: Welgon wilis
Course: Web Development / Server-side Programming
Date Created: May 2025
Table of Contents
Introduction................................ Key Concepts............................. Detailed Notes........................... Diagrams.................................... Summary.................................... Practice ..................................... Questions and Answers ..............
- Introduction
This document covers how to implement basic CRUD operations using PHP and MySQL. CRUD stands for Create, Read, Update, and Delete essential functions for managing data in web applications.
2. Key Concepts
CRUD Set of operations to manage data in a database. MySQLi / PDO PHP extensions used for connecting to MySQL databases. Database Table Collection of structured data, e.g., a users table.
3. Detailed Notes
A. Setup Database Connection
$conn = new mysqli("localhost", "root", "", "test_db"); if ($conn->connect_error) { die("Connection failed: ". $conn-
connect_error); }
B. Create Insert Data
- Summary
CRUD is the backbone of database operations in PHP. Always sanitize user input to prevent SQL injection (use prepared statements). Separate logic into functions or classes for reusability and clarity.
6. Practice Questions & Answers
Q1: What does CRUD stand for? A1: Create, Read, Update, Delete
Q2: Which PHP function is used to connect to MySQL? A2: new mysqli() or PDO()
Q3: How do you prevent SQL injection in PHP? A3: Use prepared statements ($stmt =
$conn->prepare(...))
