Online PHP editor | output for iMbEF

Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 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: Empty array output as object: {}
Output for 5.2.0 - 5.2.17: Empty array output as object: Notice: Use of undefined constant JSON_FORCE_OBJECT - assumed 'JSON_FORCE_OBJECT' in /in/iMbEF on line 3 Warning: json_encode() expects exactly 1 parameter, 2 given in /in/iMbEF on line 3
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6: Empty array output as object: Fatal error: Call to undefined function json_encode() in /in/iMbEF on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9: Empty array output as object: Fatal error: Call to undefined function: json_encode() in /in/iMbEF on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4: Empty array output as object: Fatal error: Call to undefined function: json_encode() in /in/iMbEF on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1: Empty array output as object: Fatal error: Call to undefined function: json_encode() in /in/iMbEF on line 3