(PHP 4, PHP 5, PHP 7)
imap_utf8 — Converts MIME-encoded text to UTF-8
imap_utf8 ( string $mime_encoded_text ) : string
Converts the given mime_encoded_text
to UTF-8, if the declared charset is known to libc-client. Otherwise the given text is decoded, but not converted to UTF-8.
Returns the decoded string, if possible converted to UTF-8.
Example #1 Basic imap_utf8() Usage
<?php echo imap_utf8("Johannes =?ISO-8859-1?Q?Schl=FCter?="); ?>
The above example will output something similar to:
Johannes Schlüter
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https://www.php.net/manual/en/function.imap-utf8.php