Unix and Linux Discussions Tagged with exists |
|
Thread / Thread Starter |
Last Post |
Replies |
Views |
Forum |
|
|
|
3 |
4,810 |
UNIX for Beginners Questions & Answers |
|
|
|
6 |
7,247 |
Shell Programming and Scripting |
|
|
|
5 |
6,644 |
UNIX for Beginners Questions & Answers |
|
|
|
10 |
7,680 |
UNIX for Beginners Questions & Answers |
|
|
|
3 |
3,012 |
UNIX for Beginners Questions & Answers |
|
|
|
1 |
4,721 |
Shell Programming and Scripting |
|
|
|
9 |
3,663 |
Shell Programming and Scripting |
|
|
|
3 |
4,761 |
Shell Programming and Scripting |
|
|
|
6 |
23,012 |
HP-UX |
|
|
|
1 |
9,379 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
2,616 |
UNIX for Advanced & Expert Users |
|
|
|
4 |
6,533 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
11,200 |
Shell Programming and Scripting |
|
|
|
3 |
3,000 |
UNIX for Dummies Questions & Answers |
|
|
|
27 |
9,168 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
18,809 |
Programming |
|
|
|
20 |
33,277 |
Cybersecurity |
|
|
|
1 |
2,298 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
5,313 |
UNIX for Advanced & Expert Users |
|
|
|
3 |
3,434 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
4,752 |
Programming |
|
|
|
1 |
2,521 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
3,626 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
17,698 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
24,580 |
UNIX for Dummies Questions & Answers |
|
|
|
5 |
6,207 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
34,440 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
14,644 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
3,113 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
2,527 |
UNIX for Dummies Questions & Answers |
|
|
|
5 |
10,959 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
3,861 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
2,987 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
2,494 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
18,072 |
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)