Unix and Linux Discussions Tagged with exists |
|
Thread / Thread Starter |
Last Post |
Replies |
Views |
Forum |
|
|
|
3 |
5,430 |
UNIX for Beginners Questions & Answers |
|
|
|
6 |
7,564 |
Shell Programming and Scripting |
|
|
|
5 |
7,053 |
UNIX for Beginners Questions & Answers |
|
|
|
10 |
8,212 |
UNIX for Beginners Questions & Answers |
|
|
|
3 |
3,272 |
UNIX for Beginners Questions & Answers |
|
|
|
1 |
4,765 |
Shell Programming and Scripting |
|
|
|
9 |
3,718 |
Shell Programming and Scripting |
|
|
|
3 |
4,924 |
Shell Programming and Scripting |
|
|
|
6 |
23,224 |
HP-UX |
|
|
|
1 |
9,471 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
2,661 |
UNIX for Advanced & Expert Users |
|
|
|
4 |
6,641 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
11,426 |
Shell Programming and Scripting |
|
|
|
3 |
3,128 |
UNIX for Dummies Questions & Answers |
|
|
|
27 |
9,638 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
18,887 |
Programming |
|
|
|
20 |
33,705 |
Cybersecurity |
|
|
|
1 |
2,442 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
5,526 |
UNIX for Advanced & Expert Users |
|
|
|
3 |
3,573 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
4,986 |
Programming |
|
|
|
1 |
2,609 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
3,740 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
17,919 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
24,767 |
UNIX for Dummies Questions & Answers |
|
|
|
5 |
6,328 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
35,069 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
14,780 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
3,198 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
2,590 |
UNIX for Dummies Questions & Answers |
|
|
|
5 |
11,213 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
3,927 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
3,075 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
2,578 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
18,290 |
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)