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<?php declare(strict_types=1); if(PHP_MAJOR_VERSION < 7 or PHP_MINOR_VERSION < 1) die(); function testParam(?string $arg){ var_dump($arg); } testParam(null); testParam("hi"); testParam();
based on rarhm
Output for 7.1.0 - 7.2.6
NULL string(2) "hi" Fatal error: Uncaught ArgumentCountError: Too few arguments to function testParam(), 0 passed in /in/KoUGq on line 13 and exactly 1 expected in /in/KoUGq:7 Stack trace: #0 /in/KoUGq(13): testParam() #1 {main} thrown in /in/KoUGq on line 7
Process exited with code 255.
Output for 7.0.0 - 7.0.20
Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in /in/KoUGq on line 7
Process exited with code 255.
Output for hhvm-3.15.4
Fatal error: Uncaught Error: Syntax only allowed in Hack files (<?hh) or with -v Eval.EnableHipHopSyntax=true in /in/KoUGq:7 Stack trace: #0 {main}
Process exited with code 255.
Output for 5.6.0 - 5.6.30
Warning: Unsupported declare 'strict_types' in /in/KoUGq on line 3 Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in /in/KoUGq on line 7
Process exited with code 255.