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run code in 150+ php & hhvm versions
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<?php $data = json_decode('{"value": 4565.85}'); echo $data->value."\n"; var_dump($data->value)."\n"; ini_set('precision', 20); echo $data->value."\n"; var_dump($data->value)."\n";
based on NSJDC
Output for 5.4.34 - 5.6.28, 7.0.0 - 7.1.0
4565.85 float(4565.85) 4565.8500000000003638 float(4565.8500000000003638)
Output for hhvm-3.12.0
4565.85 float(4565.85) 4565.85 float(4565.85)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.4.32
4565.85 float(4565.85) Warning: ini_set() has been disabled for security reasons in /in/B5qIO on line 7 4565.85 float(4565.85)
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_decode() in /in/B5qIO 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/B5qIO 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/B5qIO 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/B5qIO on line 3