(PHP 4 >= 4.0.5, PHP 5, PHP 7, PHP 8)
iconv_set_encoding — Set current setting for character encoding conversion
   Changes the value of the internal configuration variable specified by
   type to encoding.
  
type
       The value of type can be any one of these:
       
encodingThe character set.
Example #1 iconv_set_encoding() example
<?php
iconv_set_encoding("internal_encoding", "UTF-8");
iconv_set_encoding("output_encoding", "ISO-8859-1");
?>