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<?php $result = json_decode(''); var_dump(array( 'result' => $result, 'json_last_error' => json_last_error(), 'json_last_error_msg' => json_last_error_msg() ));
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, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(3) { ["result"]=> NULL ["json_last_error"]=> int(4) ["json_last_error_msg"]=> string(12) "Syntax error" }
Output for 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
array(3) { ["result"]=> NULL ["json_last_error"]=> int(0) ["json_last_error_msg"]=> string(8) "No error" }
Output for 5.4.0 - 5.4.45
Fatal error: Call to undefined function json_last_error_msg() in /in/b8lAF on line 8
Process exited with code 255.

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