3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 'BIT'; debug_zval_dump($a); $b = &$a; $c = &$a; debug_zval_dump($a);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
string(3) "BIT" interned string(3) "BIT" interned
Output for 7.0.0 - 7.0.20, 7.1.0, 7.1.7 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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(3)
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.21
string(3) "BIT" refcount(2) string(3) "BIT" refcount(1)
preferences:
145.88 ms | 402 KiB | 182 Q