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ReflectionClass::getConstants — 获取一组常量
获取一个类中所有已定义的常量。
本函数还未编写文档,仅有参数列表。
此函数没有参数。
常量的 数组 ,常量名是数组的键,常量的值是数组的值。
[#1] davide dot renzi at gmail dot com [2014-07-16 11:21:15]
If you want to return the constants defined inside a class then you can also define an internal method as follows:
<?php
class myClass {
const NONE = 0;
const REQUEST = 100;
const AUTH = 101;
// others...
static function getConstants() {
$oClass = new ReflectionClass(__CLASS__);
return $oClass->getConstants();
}
}
?>
[#2] shgninc at gmail dot com [2013-11-20 10:00:52]
I use a functions to do somthing base on the class constant name as below. This example maybe helpful for everybody.
<?php
public function renderData($question_type = NULL, $data = array()) {
$types = array();
$qt = new ReflectionClass(questionType);
$types = $qt->getConstants();
if ($type = array_search($question_type, $types)){
//.....Do somthing
}
}
?>
[#3] djhob1972 at yahoo dot com dot au [2009-12-16 05:42:48]
I was trying to determine how to get a var_dump of constants that are within an interface. Thats right, not using any classes but the interface itself.
Along my travels I found it quite interesting that the ReflectionClass along with a direct call to the interface will also dump its constants. Perfect!!!!
This was using PHP 5.3.1 and my example as below:-
1st File:
constants.php
<?php
<?php>
interface MyConstants
{
// --------------------------
// Programmatic Level
// --------------------------
const DEBUG_MODE_ACTIVE = FALSE;
const PHP_VERSION_REQUIREMENT = "5.1.2";
}
?>
=======
Second file:
=======
test.php
<?php>
include_once ("constants.php");
$oClass = new ReflectionClass ('MyConstants');
$array = $oClass->getConstants ();
var_dump ($array);
unset ($oClass);
?>
what you would get from the command line:-
?:\???\htdocs\????>php test.php
array(2) {
["DEBUG_MODE_ACTIVE"]=> bool(false)
["PHP_VERSION_REQUIREMENT"]=> string(5) "5.1.2"
But as you can see this can work quite well to your advantage in many ways so I truely hope this helps someone else with a similar headache in the future to come!
Enjoy!