3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var1 = 'Hello World'; $var2 = ''; $var2 =& $var1; debug_zval_dump($var1);
based on e31sB

Shows result from various feature-branches currently under review from the php developers. Contact me to have additional branches featured.

Output for branch master
string(11) "Hello World" refcount(1)

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page