Unix and Linux Discussions Tagged with exists |
|
Thread / Thread Starter |
Last Post |
Replies |
Views |
Forum |
|
|
|
3 |
4,030 |
UNIX for Beginners Questions & Answers |
|
|
|
6 |
6,418 |
Shell Programming and Scripting |
|
|
|
5 |
6,281 |
UNIX for Beginners Questions & Answers |
|
|
|
10 |
7,319 |
UNIX for Beginners Questions & Answers |
|
|
|
3 |
2,867 |
UNIX for Beginners Questions & Answers |
|
|
|
1 |
4,688 |
Shell Programming and Scripting |
|
|
|
9 |
3,609 |
Shell Programming and Scripting |
|
|
|
3 |
4,672 |
Shell Programming and Scripting |
|
|
|
6 |
22,891 |
HP-UX |
|
|
|
1 |
9,316 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
2,604 |
UNIX for Advanced & Expert Users |
|
|
|
4 |
6,468 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
9,684 |
Shell Programming and Scripting |
|
|
|
3 |
2,920 |
UNIX for Dummies Questions & Answers |
|
|
|
27 |
8,898 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
18,773 |
Programming |
|
|
|
20 |
32,999 |
Cybersecurity |
|
|
|
1 |
2,230 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
5,206 |
UNIX for Advanced & Expert Users |
|
|
|
3 |
3,340 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
4,639 |
Programming |
|
|
|
1 |
2,474 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
3,557 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
17,534 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
24,426 |
UNIX for Dummies Questions & Answers |
|
|
|
5 |
6,145 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
34,163 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
14,576 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
3,071 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
2,492 |
UNIX for Dummies Questions & Answers |
|
|
|
5 |
10,814 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
3,825 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
2,959 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
2,446 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
17,933 |
UNIX for Dummies Questions & Answers |
DEFINED(3) 1 DEFINED(3)
defined - Checks whether a given named constant exists
SYNOPSIS
bool defined (string $name)
DESCRIPTION
Checks whether the given constant exists and is defined.
Note
If you want to see if a variable exists, use isset(3) as defined(3) only applies to constants. If you want to see if a function
exists, use function_exists(3).
PARAMETERS
o $name
- The constant name.
RETURN VALUES
Returns TRUE if the named constant given by $name has been defined, FALSE otherwise.
EXAMPLES
Example #1
Checking Constants
<?php
/* Note the use of quotes, this is important. This example is checking
* if the string 'TEST' is the name of a constant named TEST */
if (defined('TEST')) {
echo TEST;
}
?>
SEE ALSO
define(3), constant(3), get_defined_constants(3), function_exists(3), The section on Constants.
PHP Documentation Group DEFINED(3)