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run code in 150+ php & hhvm versions
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<?php echo json_encode("äöü")."----".json_decode("\u00e4\u00f6\u00fc")."----".json_decode(json_encode("äöü"));
based on gJAbS
Output for 5.2.9 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
"\u00e4\u00f6\u00fc"--------äöü
Output for 5.2.2 - 5.2.8
"\u00e4\u00f6\u00fc"----\u00e4\u00f6\u00fc----äöü
Output for 5.2.1
"\u00e4\u00f6\u00fc"----\u00e4\u00f6\u00fc----\u00e4\u00f6\u00fc
Output for 5.2.0
"\u00e4\u00f6\u00fc"--------
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/aPQUh 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/aPQUh 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/aPQUh 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/aPQUh on line 2