PHP 7.2.0 Beta 1 Released

ReflectionClass::getConstants

(PHP 5, PHP 7)

ReflectionClass::getConstantsGets constants

Description

public array ReflectionClass::getConstants ( void )

Gets all defined constants from a class, regardless of their visibility.

Parameters

This function has no parameters.

Return Values

An array of constants, where the keys hold the name and the values the value of the constants.

See Also

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User Contributed Notes 4 notes

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12
davide dot renzi at gmail dot com
3 years ago
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();
    }
}
?>
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2
djhob1972 at yahoo dot com dot au
7 years ago
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!
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1
Sandor Toth
8 months ago
You can pass $this as class for the ReflectionClass. __CLASS__ won't help if you extend the original class, because it is a magic constant based on the file itself.

<?php

class Example {
  const
TYPE_A = 1;
  const
TYPE_B = 'hello';

  public function
getConstants()
  {
   
$reflectionClass = new ReflectionClass($this);
    return
$reflectionClass->getConstants();
  }
}

$example = new Example();
var_dump($example->getConstants());

// Result:
array ( size = 2)
 
'TYPE_A' => int 1
 
'TYPE_B' => (string) 'hello'
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0
shgninc at gmail dot com
3 years ago
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
}
}
?>
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