note 102809 added to function.constant

You can get the value of class and interface constants using this function.

<?php
interface IDatabase {
   const Test = 22;
}

class MyDatabase implements IDatabase {

}

echo constant('MyDatabase::Test'); # Outputs 22
echo constant('IDatabase::Test'); # Also outputs 22
?>
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Manual Page -- http://www.php.net/manual/en/function.constant.php
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