3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 'BIT'; debug_zval_dump($a); $b = $a; debug_zval_dump($a);
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
string(3) "BIT" interned string(3) "BIT" interned
Output for 7.0.0 - 7.0.20, 7.1.0, 7.1.7 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
string(3) "BIT" refcount(1) string(3) "BIT" refcount(1)
Output for 7.1.5 - 7.1.6
string(3) "BIT" refcount(3) string(3) "BIT" refcount(4)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
string(3) "BIT" refcount(2) string(3) "BIT" refcount(3)
preferences:
137.23 ms | 411 KiB | 5 Q