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<?php
echo urldecode('%E4%EC%E8');


echo  mb_convert_encoding ( 'äìè', 'ISO-8859-1', 'windows-1251' );
echo "\n";
echo  mb_convert_encoding ( 'äìè', 'windows-1251', 'ISO-8859-1' );

eol versions

Output
Performance
VLD opcodes
References
Segmentation fault
RFC branches

Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0: ��?�?�?? ?�?�??