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<?php $str = 'zażółć gęśla jaźń'; echo json_escape($str).PHP_EOL; echo json_escape($str, JSON_UNESCAPED_UNICODE).PHP_EOL;
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Call to undefined function json_escape() in /in/Sbr6K:5 Stack trace: #0 {main} thrown in /in/Sbr6K on line 5
Process exited with code 255.
Output for 5.3.22 - 5.6.28
Fatal error: Call to undefined function json_escape() in /in/Sbr6K on line 5
Process exited with code 255.