3v4l.org

run code in 300+ PHP versions simultaneously
<?php define('TEST_CONST', 1); var_dump(\defined('TEST_CONST')); var_dump(\defined('test_const'));
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 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 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.15, 8.4.1 - 8.4.3
bool(true) bool(false)
Output for 4.3.5 - 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
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/DA23r on line 5 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/DA23r on line 6 bool(true) bool(false)
Output for 4.3.0 - 4.3.4
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/DA23r on line 5 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/DA23r on line 6 int(1) int(0)
preferences:
168.25 ms | 408 KiB | 5 Q