get_current_user
Though the syntax editors mark the following as error, it executes successfully under PHP, as you desire.
<?php
$user_defined_constants=get_defined_constants(true)['user'];
print_r($user_defined_constants);
?>
No errors/warnings seen.
Only the special thing here is, you are passing true to the function, and extracting the result's 'user' index directly.
get_defined_constants
(PHP 4 >= 4.1.0, PHP 5)
get_defined_constants — 모든 상수와 그 값의 연관 배열을 반환합니다
설명
array get_defined_constants
([ bool $categorize
] )
현재 정의된 모든 상수의 이름과 값을 반환합니다. 여기에는 확장 모듈에서 작성한 상수와 define() 함수로 작성한 상수를 포함합니다.
인수
- categorize
-
분류를 1차원 키로 사용하고, 상수와 값을 2차원에 넣는 다차원 배열을 반환하도록 합니다.
<?php
define("MY_CONSTANT", 1);
print_r(get_defined_constants(true));
?>위 예제의 출력 예시:
Array ( [internal] => Array ( [E_ERROR] => 1 [E_WARNING] => 2 [E_PARSE] => 4 [E_NOTICE] => 8 [E_CORE_ERROR] => 16 [E_CORE_WARNING] => 32 [E_COMPILE_ERROR] => 64 [E_COMPILE_WARNING] => 128 [E_USER_ERROR] => 256 [E_USER_WARNING] => 512 [E_USER_NOTICE] => 1024 [E_ALL] => 2047 [TRUE] => 1 ) [pcre] => Array ( [PREG_PATTERN_ORDER] => 1 [PREG_SET_ORDER] => 2 [PREG_OFFSET_CAPTURE] => 256 [PREG_SPLIT_NO_EMPTY] => 1 [PREG_SPLIT_DELIM_CAPTURE] => 2 [PREG_SPLIT_OFFSET_CAPTURE] => 4 [PREG_GREP_INVERT] => 1 ) [user] => Array ( [MY_CONSTANT] => 1 ) )
반환값
변경점
| 버전 | 설명 |
|---|---|
| 5.0.0 | categorize 인수가 추가되었습니다. |
예제
Example #1 get_defined_constants() 예제
<?php
print_r(get_defined_constants());
?>
위 예제의 출력 예시:
Array
(
[E_ERROR] => 1
[E_WARNING] => 2
[E_PARSE] => 4
[E_NOTICE] => 8
[E_CORE_ERROR] => 16
[E_CORE_WARNING] => 32
[E_COMPILE_ERROR] => 64
[E_COMPILE_WARNING] => 128
[E_USER_ERROR] => 256
[E_USER_WARNING] => 512
[E_USER_NOTICE] => 1024
[E_ALL] => 2047
[TRUE] => 1
)
참고
- defined() - Checks whether a given named constant exists
- get_loaded_extensions() - 적재된 모든 모듈명을 배열로 반환합니다
- get_defined_functions() - Returns an array of all defined functions
- get_defined_vars() - 모든 정의된 변수의 배열을 반환
add a note
User Contributed Notes
get_defined_constants - [4 notes]
bimal at sanjaal dot com ¶
2 months ago
Bob ¶
4 years ago
Add this method to your class definition if you want an array of class constants (get_defined_constants doesn't work with class constants as Peter P said above):
<?php
public function get_class_constants()
{
$reflect = new ReflectionClass(get_class($this));
return $reflect->getConstants());
}
?>
You could also override stdObject with it so that all your classes have this method
Anonymous ¶
7 years ago
If you want to filter through and return only the prefix for your constants (i.e. you have constants with a naming scheme), then you can use this quick little function. It comes in handy for debugging.
<?php
function returnConstants ($prefix) {
foreach (get_defined_constants() as $key=>$value)
if (substr($key,0,strlen($prefix))==$prefix) $dump[$key] = $value;
if(empty($dump)) { return "Error: No Constants found with prefix '".$prefix."'"; }
else { return $dump; }
}
?>
Example:
<?php
define("SITENAME_OPTION_ONE",true);
define("SITENAME_OPTION_TWO",false);
define("SITENAME_URL","foo");
print_r(returnConstants("SITENAME_OPTION"));
?>
Will return:
Array
(
[SITENAME_OPTIONONE] => 1
[SITENAME_OPTIONTWO] =>
)
me at gogogadgetscott dot info ¶
7 years ago
<?php
/**
* Convert constant value into string name.
*
* @param mixed Constant value.
* @return string Constant name.
* @access public
*/
function sch_get_consant($value)
{
$constants = get_defined_constants();
$name = array_search($value, $constants, TRUE);
return $name;
}
?>