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@ 2013-09-13T17:17:13Z

<?php
class Drupal {
}

class Drupal1 {
    const CORE_COMPATIBILITY = 'Drupal1';
}

if (class_exists('Drupal') && defined('Drupal::CORE_COMPATIBILITY')) {
    echo Drupal::CORE_COMPATIBILITY;
}

if (class_exists('Drupal1') && defined('Drupal1::CORE_COMPATIBILITY')) {
    echo Drupal1::CORE_COMPATIBILITY;
}

Output
Performance
VLD
References
Branches

class_exists: documentation ( source)
defined: documentation ( source)

preferences:dark modelive preview

60.87 ms | 402 KiB | 5 Q