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<?php var_dump(json_decode('{"pincode":0000}')); var_dump(json_decode('{"pincode":0}')); var_dump(json_decode('{"pincode":"0000"}'));
Output for 5.2.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
NULL object(stdClass)#1 (1) { ["pincode"]=> int(0) } object(stdClass)#1 (1) { ["pincode"]=> string(4) "0000" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_decode() in /in/d9mTd 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/d9mTd 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/d9mTd 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/d9mTd on line 2