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run code in 150+ php & hhvm versions
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<?php var_dump(json_encode("//"));
based on mDFvT
Output for 5.2.0 - 7.1.0
string(6) ""\/\/""
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/O2N1A on line 2
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_encode() in /in/O2N1A on line 2
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_encode() in /in/O2N1A on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_encode() in /in/O2N1A on line 2