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<?php declare(strict_types = 1); $contributors = ['Me', 'To']; $results = array_walk($contributors, function(string $contributor) : string { return sprintf("%s, thank you very much for PHP7!", $contributor); }); echo implode("\n", $results);
Output for 8.3.0 - 8.3.4
Fatal error: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, true given in /in/Wu7HB:7 Stack trace: #0 /in/Wu7HB(7): implode('\n', true) #1 {main} thrown in /in/Wu7HB on line 7
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17
Fatal error: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, bool given in /in/Wu7HB:7 Stack trace: #0 /in/Wu7HB(7): implode('\n', true) #1 {main} thrown in /in/Wu7HB on line 7
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: implode(): Invalid arguments passed in /in/Wu7HB on line 7
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Warning: Unsupported declare 'strict_types' in /in/Wu7HB on line 2 Parse error: syntax error, unexpected ':', expecting '{' in /in/Wu7HB on line 4
Process exited with code 255.

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