Understanding Predefined Variables

Predefined variables are special variables automatically accessible in your PHP scripts, containing information about the server, environment, and user input.

Examples of Using Predefined Variables

1. Server Information

    $serverName = $_SERVER['SERVER_NAME'];
    echo "You are currently visiting: $serverName";
    

2. User Input

These examples demonstrate how predefined variables provide valuable information without manual definition.

Key Notes

• Predefined variables are available throughout your script without global declarations.
• Different types of predefined variables exist, such as server information, environment variables, and user input.
• Using predefined variables effectively can improve code efficiency and simplify access to essential information.

Remember, understanding and utilizing predefined variables enhances your PHP coding skills and streamlines development.