(PHP 4 >= 4.0.5, PHP 5, PHP 7)
iconv_set_encoding — Set current setting for character encoding conversion
iconv_set_encoding ( string $type , string $encoding ) : bool
Changes the value of the internal configuration variable specified by type to encoding.
type
The value of type can be any one of these:
encoding
The character set.
Returns true on success or false on failure.
Example #1 iconv_set_encoding() example
<?php
iconv_set_encoding("internal_encoding", "UTF-8");
iconv_set_encoding("output_encoding", "ISO-8859-1");
?>
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https://www.php.net/manual/en/function.iconv-set-encoding.php