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<?php var_dump(iconv('ascii', 'ascii', ''));
based on r0dgB
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
string(0) ""
Output for 7.0.6
Fatal error: Uncaught Error: Call to undefined function iconv() in /in/DmEQP:3 Stack trace: #0 {main} thrown in /in/DmEQP 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/DmEQP on line 3
Process exited with code 255.