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PHP Constants

12 min read

What is PHP Constants?

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

Syntax & Usage

The syntax and usage patterns for PHP Constants 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 Constants:

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 Constants. Practice writing code to reinforce these concepts and move on to the next lesson when you feel comfortable.

Examples

Example
php 
<?php
echo "Hello from PHP Constants!";

$items = ['Learn', 'Practice', 'Build'];
foreach ($items as $item) {
    echo "$item PHP\n";
}
?>
Practice Yourself »

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