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<?php var_dump((utf8_decode(json_decode("\"\u00c2\u00b0C\""))));
based on j5Noh
Output for 5.2.2 - 7.1.0
string(3) "°C"
Output for 5.2.1
string(13) "\u00c2\u00b0C"
Output for 5.2.0
string(0) ""
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_decode() in /in/U3rrS on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_decode() in /in/U3rrS on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_decode() in /in/U3rrS on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_decode() in /in/U3rrS on line 3