Unix and Linux Discussions Tagged with exists |
|
Thread / Thread Starter |
Last Post |
Replies |
Views |
Forum |
|
|
|
3 |
5,097 |
UNIX for Beginners Questions & Answers |
|
|
|
6 |
7,436 |
Shell Programming and Scripting |
|
|
|
5 |
6,886 |
UNIX for Beginners Questions & Answers |
|
|
|
10 |
7,972 |
UNIX for Beginners Questions & Answers |
|
|
|
3 |
3,155 |
UNIX for Beginners Questions & Answers |
|
|
|
1 |
4,752 |
Shell Programming and Scripting |
|
|
|
9 |
3,704 |
Shell Programming and Scripting |
|
|
|
3 |
4,860 |
Shell Programming and Scripting |
|
|
|
6 |
23,128 |
HP-UX |
|
|
|
1 |
9,443 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
2,651 |
UNIX for Advanced & Expert Users |
|
|
|
4 |
6,602 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
11,347 |
Shell Programming and Scripting |
|
|
|
3 |
3,076 |
UNIX for Dummies Questions & Answers |
|
|
|
27 |
9,438 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
18,861 |
Programming |
|
|
|
20 |
33,547 |
Cybersecurity |
|
|
|
1 |
2,384 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
5,438 |
UNIX for Advanced & Expert Users |
|
|
|
3 |
3,518 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
4,888 |
Programming |
|
|
|
1 |
2,585 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
3,703 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
17,857 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
24,701 |
UNIX for Dummies Questions & Answers |
|
|
|
5 |
6,281 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
34,790 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
14,726 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
3,167 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
2,573 |
UNIX for Dummies Questions & Answers |
|
|
|
5 |
11,127 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
3,907 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
3,050 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
2,555 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
18,203 |
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)