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run code in 150+ php & hhvm versions
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<?php var_dump(json_decode('"data": { "msg_id": "b", "msg_title": "a", "msg_type": "c" }'));
based on rjDYF
Output for 5.2.0, 5.2.9 - 5.6.21, hhvm-3.12.0, 7.0.0 - 7.1.0
NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.1 - 5.2.8
string(62) ""data": { "msg_id": "b", "msg_title": "a", "msg_type": "c" }"
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_decode() in /in/GX7Jk on line 2
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_decode() in /in/GX7Jk on line 2
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_decode() in /in/GX7Jk on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_decode() in /in/GX7Jk on line 2