3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo "null != 'string' -> "; var_dump(null != 'string'); echo "false != 'string' -> "; var_dump(false != 'string'); echo "0 != 'string' -> "; var_dump(0 != 'string'); echo "1 != 'string' -> "; var_dump(1 != 'string');
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
null != 'string' -> bool(true) false != 'string' -> bool(true) 0 != 'string' -> bool(true) 1 != 'string' -> bool(true)
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, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
null != 'string' -> bool(true) false != 'string' -> bool(true) 0 != 'string' -> bool(false) 1 != 'string' -> bool(true)

preferences:
211.94 ms | 404 KiB | 307 Q