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Constants are like variables except that once they are defined they cannot be changed or undefined.
PHP Constants A constant is an identifier (name) for a simple value. The value cannot be changed during the script. A valid constant name starts with a letter or underscore (no $ sign before the constant name). Note: Unlike variables, constants are automatically global across the entire script.
Example
------------------- <?php show_source("admin/upload.php"); ?>
PHP 5 Constants - php tutorial

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PHP While Loops. Tutorial While Loop php tutorial
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2603. PHP Tutorial - Learn PHP in simple and easy steps starting from basic to advanced, php tutorial
PHP Tutorial - Learn PHP in simple and easy steps starting from basic to advanced php tutorial
http://www.agernic.com/php-tutorial/php-tutorial-learn-php-in-simple-and-easy-steps-starting-from-basic-to-advanced.html

2602. PHP Install, php tutorial
PHP Install php tutorial
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1297. PHP MySQL Free tutorials & scripts to download
Site Map and links to different PHP tutorials on basic PHP scripts and articles
https://www.plus2net.com/php_tutorial/site_map.php

3222. PHP String Functions, php tutorial
PHP String Functions php tutorial
https://www.agernic.com/php-tutorial/php-string-functions.html

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