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run code in 200+ php & hhvm versions
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<?php $str = 'test "test2"'; var_dump(jsone_encode($str) );
based on LJt9f
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Call to undefined function jsone_encode() in /in/KJQWn:4 Stack trace: #0 {main} thrown in /in/KJQWn on line 4
Process exited with code 255.
Output for 5.3.20 - 5.6.28
Fatal error: Call to undefined function jsone_encode() in /in/KJQWn on line 4
Process exited with code 255.