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run code in 150+ php & hhvm versions
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<?php $t = '{ "test": true } '; $t = json_decode($t); var_dump($t);
Output for 5.2.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(stdClass)#1 (1) { ["test"]=> bool(true) }
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/ffS9R on line 8
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_decode() in /in/ffS9R on line 8
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_decode() in /in/ffS9R on line 8
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_decode() in /in/ffS9R on line 8