Constants are variables
Constants are variables except that once they are defined they can’t be changed or undefined.
Constants are variables except that once they are defined they can’t be changed or undefined.
- 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
- You can create a constant by using the define () function.
- Use the define function to specify the name and value of a constant. (name, value, case-insensitive).
- Many programmers use capital letters to name constants – so they stand out.
- Note: Since a constant can not be change you do not use a $ sign before it’s name when you declare it or (use it).
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
How to declare constants
Examples:
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
How to declare constants
Examples:
PHP Constant Examples
1
2
3
4
5
6
7
|
<!DOCTYPE html>
<html>
<body>
<?php // case-sensitive constant name define("GREETING", "Welcome to PHP.com!");
echo GREETING; ?>
</body>
</html>
|
Tidak ada komentar:
Posting Komentar