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PHP Form Validation

13 min read

What is PHP Form Validation?

In this lesson, we explore PHP Form Validation. This is an important concept in PHP development that you will use frequently when building real-world projects. Understanding PHP Form Validation will help you write cleaner, more efficient code.

Syntax & Usage

The syntax and usage patterns for PHP Form Validation follow standard PHP conventions. Below you will see code examples that demonstrate the most common use cases. Try modifying these examples in your own editor to experiment with different approaches.

Example

Here is a practical example demonstrating PHP Form Validation:

Tips & Best Practices

  • Always sanitize user input to prevent SQL injection and XSS
  • Use prepared statements for database queries
  • Follow PSR coding standards for consistent code
  • Use Composer for dependency management

Summary

In this lesson you learned about PHP Form Validation. Practice writing code to reinforce these concepts and move on to the next lesson when you feel comfortable.

Examples

Example
php 
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = htmlspecialchars($_POST["name"]);
    $email = filter_var($_POST["email"], FILTER_SANITIZE_EMAIL);

    if (empty($name)) {
        echo "Name is required";
    } elseif (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
        echo "Invalid email format";
    } else {
        echo "Welcome, $name!";
    }
}
?>

<form method="post">
  Name: <input type="text" name="name">
  Email: <input type="email" name="email">
  <input type="submit">
</form>
Practice Yourself »

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PHP Form Handling
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PHP Required Fields