3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(STDIN); // null in hhvm, resource in php5 var_dump(\STDIN); // resource in hhvm, resource in php5
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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
resource(1) of type (stream) resource(1) of type (stream)
Output for 5.2.3 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/MORDB on line 4 resource(1) of type (stream) resource(1) of type (stream)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.1 - 5.1.6, 5.2.0 - 5.2.2
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/MORDB on line 4 Notice: Use of undefined constant STDIN - assumed 'STDIN' in /in/MORDB on line 3 string(5) "STDIN" Notice: Use of undefined constant STDIN - assumed 'STDIN' in /in/MORDB on line 4 string(5) "STDIN"
Output for 5.1.0
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/MORDB on line 4 Fatal error: fatal flex scanner internal error--end of buffer missed in /in/MORDB on line 4
Process exited with code 255.

preferences:
299.27 ms | 401 KiB | 422 Q