3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface CommerceLicenseBillingUsageGroupNamesInterface { public static function usageGroupNames(); } class TestLicense implements CommerceLicenseBillingUsageGroupNamesInterface { public static function usageGroupNames() { return array( 'test_group' => array( 'title' => 'Test Group', ), ); } } $l = new TestLicense(); print_r($l->usageGroupNames());
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [test_group] => Array ( [title] => Test Group ) )

preferences:
218.9 ms | 404 KiB | 376 Q