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run code in 200+ php & hhvm versions
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<?php $u = '孙悟空'; echo iconv(mb_detect_encoding($u), "UTF-8", $u);
based on UYsIL
Output for 5.3.19 - 5.5.34, 5.6.8 - 5.6.20, 5.6.28 - 7.0.5, 7.0.20 - 7.2.0
孙悟空
Output for 7.0.6
Fatal error: Uncaught Error: Call to undefined function iconv() in /in/n5sKT:5 Stack trace: #0 {main} thrown in /in/n5sKT on line 5
Process exited with code 255.
Output for 5.5.35, 5.6.21
Fatal error: Call to undefined function iconv() in /in/n5sKT on line 5
Process exited with code 255.