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<?php var_dump(json_decode('{"_BLANK_":1,"":2}'));
Output for 7.1.0
object(stdClass)#1 (2) { ["_BLANK_"]=> int(1) [""]=> int(2) }
Output for 5.2.0 - 7.0.14
object(stdClass)#1 (2) { ["_BLANK_"]=> int(1) ["_empty_"]=> int(2) }
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_decode() in /in/4e5hs 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/4e5hs 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/4e5hs 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/4e5hs on line 3