(PHP 4, PHP 5, PHP 7, PHP 8)
imap_binary — Convert an 8bit string to a base64 string
imap_binary(string $string): string|false
Convert an 8bit string to a base64 string according to » RFC2045, Section 6.8.
stringThe 8bit string
Returns a base64 encoded string, or false on failure.
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https://www.php.net/manual/en/function.imap-binary.php