php man page for defined

Query: defined

OS: php

Section: 3

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

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)
Related Man Pages
array_key_exists(3) - php
apc_load_constants(3) - php
function_exists(3) - php
get_defined_constants(3) - php
method_exists(3) - php
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