3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, JSON_UNESCAPED_UNICODE, JSON_BIGINT_AS_STRING);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
int(128) int(64) int(256) int(2)
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
Notice: Use of undefined constant JSON_PRETTY_PRINT - assumed 'JSON_PRETTY_PRINT' in /in/f7S7Z on line 2 Notice: Use of undefined constant JSON_UNESCAPED_SLASHES - assumed 'JSON_UNESCAPED_SLASHES' in /in/f7S7Z on line 2 Notice: Use of undefined constant JSON_UNESCAPED_UNICODE - assumed 'JSON_UNESCAPED_UNICODE' in /in/f7S7Z on line 2 Notice: Use of undefined constant JSON_BIGINT_AS_STRING - assumed 'JSON_BIGINT_AS_STRING' in /in/f7S7Z on line 2 string(17) "JSON_PRETTY_PRINT" string(22) "JSON_UNESCAPED_SLASHES" string(22) "JSON_UNESCAPED_UNICODE" string(21) "JSON_BIGINT_AS_STRING"

preferences:
284.75 ms | 403 KiB | 456 Q