Online PHP editor | output for MFIGa

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Fatal error: Uncaught TypeError: preg_replace_callback(): Argument #2 ($callback) must be a valid callback, class "$this" not found in /in/MFIGa:9 Stack trace: #0 /in/MFIGa(9): preg_replace_callback('/\\\\u([0-9a-f]{4...', '$this::replace_...', '{"name":"F\\u00f...') #1 /in/MFIGa(14): utils::to_decode('{"name":"F\\u00f...') #2 {main} thrown in /in/MFIGa on line 9
Process exited with code 255.
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33: Warning: preg_replace_callback(): Requires argument 2, '$this::replace_unicode_escape_sequence', to be a valid callback in /in/MFIGa on line 9 {"name":"F\u00f6retag: Betalning"}
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6: Warning: preg_replace_callback(): requires argument 2, '$this::replace_unicode_escape_sequence', to be a valid callback in /in/MFIGa on line 9 {"name":"F\u00f6retag: Betalning"}
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/MFIGa on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/MFIGa on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/MFIGa on line 4
Process exited with code 255.