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<?php var_dump(iconv('ert', 'ert', ''));
based on Jh0vI
Output for 5.3.19 - 5.5.34, 5.6.8 - 5.6.20, 7.0.0 - 7.0.5, 7.0.20 - 7.2.0
Notice: iconv(): Wrong charset, conversion from `ert' to `ert' is not allowed in /in/MbhpQ on line 3 bool(false)
Output for 7.0.6
Fatal error: Uncaught Error: Call to undefined function iconv() in /in/MbhpQ:3 Stack trace: #0 {main} thrown in /in/MbhpQ on line 3
Process exited with code 255.
Output for 5.5.35, 5.6.21
Fatal error: Call to undefined function iconv() in /in/MbhpQ on line 3
Process exited with code 255.