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iconv - Wikipedia
iconv(3) - Linux manual page - man7.org
libiconv - GNU Project - Free Software Foundation (FSF)
PHP: iconv - Manual
How To Use the iconv Command on Linux - How-To Geek
iconv(1) - Linux manual page - man7.org
iconv Examples (The GNU C Library)
ICONV - GNU
PHP: iconv - Manual
iconv(1) - Linux man page