3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [42]; $b = []; $b[] = 42; debug_zval_dump([42], $a, $b);
Output for 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(1) packed refcount(2){ [0]=> int(42) } array(1) packed refcount(3){ [0]=> int(42) } array(1) packed refcount(2){ [0]=> int(42) }
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30
array(1) refcount(2){ [0]=> int(42) } array(1) refcount(3){ [0]=> int(42) } array(1) refcount(2){ [0]=> int(42) }
preferences:
99.61 ms | 1383 KiB | 4 Q