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Max Azimov
Санкт-Петербург

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PHP 5 Constants
 
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.

 
Create a PHP Constant
 
To create a constant, use the define() function.
 
Syntax
 
define(name, value, case-insensitive)
 
Parameters:
  • name: Specifies the name of the constant
  • value: Specifies the value of the constant
  • case-insensitive: Specifies whether the constant name should be case-insensitive. Default is false
The example below creates a constant with a case-sensitive name:

 
Example
 
<?php
define("GREETING", "Welcome to W3Schools.com!");
echo GREETING;
?>
 
The example below creates a constant with a case-insensitive name:

 
Example
  1. <?php
  2. define("GREETING", "Welcome to W3Schools.com!", true);
  3. echo greeting;
  4. ?>
 
Constants are Global
 
Constants are automatically global and can be used across the entire script.
 
The example below uses a constant inside a function, even if it is defined outside the function:

 
Example
  1. <?php
  2. define("GREETING", "Welcome to W3Schools.com!");
  3. function myTest() {
  4.     echo GREETING;
  5. }
  6. myTest();
  7. ?>


2016-12-08
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