3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(json_encode([])); var_dump(json_encode(array())); var_dump(json_encode([0])); var_dump(json_encode(array(0)));
Output for 7.0.0 - 7.0.24, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 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, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
string(2) "[]" string(2) "[]" string(3) "[0]" string(3) "[0]"
preferences:
116.26 ms | 1475 KiB | 4 Q