src/Mime/Mime.php
public static function encodeValue($value, $wrapWidth = 998, $folding = "\r\n ")
    {
        if (!preg_match('~[^\x00-\x7F]~', $value)) {
            $encoding = '7bit';
        } elseif (preg_match_all('/[\000-\010\013\014\016-\037\177-\377]/', $value) > (strlen($value) / 3)) {
            $encoding = 'base64';
        } else {
            $encoding = 'quoted-printable';
        }

        $encodedName = Mime::encode($value, $encoding, $wrapWidth, $folding, true);

        $value = trim(str_replace(["\r", "\n"], '', $value));

        if ($encoding === 'base64') {
            $encodedName = "=?UTF-8?B?{$encodedName}?=";
        } elseif ($encoding === 'quoted-printable') {
            $encodedName = "=?UTF-8?Q?{$encodedName}?=";
        } else {
            $encodedName = addcslashes($encodedName, "\0..\37\177\\\"");
            if ($encodedName !== $value || preg_match('/[^A-Za-z0-9!#$%&\'*+\/=?^_`{|}~ -]/', $value) === 1) {
                $encodedName = sprintf('"%s"', $encodedName);
            }
        }
        return $encodedName;
    }
public static function encodeValue($value, $wrapWidth = 998, $folding = "\r\n ")
    {
        if (!preg_match('~[^\x00-\x7F]~', $value)) {
            $encoding = '7bit';
        } elseif (preg_match_all('/[\000-\010\013\014\016-\037\177-\377]/', $value) > (strlen($value) / 3)) {
            $encoding = 'base64';
        } else {
            $encoding = 'quoted-printable';
        }

        $encodedName = Mime::encode($value, $encoding, $wrapWidth, $folding, true);

        $value = trim(str_replace(["\r", "\n"], '', $value));

        if ($encoding === 'base64') {
            $encodedName = "=?UTF-8?B?{$encodedName}?=";
        } elseif ($encoding === 'quoted-printable') {
            $encodedName = "=?UTF-8?Q?{$encodedName}?=";
        } else {
            $encodedName = addcslashes($encodedName, "\0..\37\177\\\"");
            if ($encodedName !== $value || preg_match('/[^A-Za-z0-9!#$%&\'*+\/=?^_`{|}~ -]/', $value) === 1) {
                $encodedName = sprintf('"%s"', $encodedName);
            }
        }
        return $encodedName;
    }
public static function encodeValue ( $ value , $ wrapWidth = 998 , $ folding = "\r\n " ) { if ( ! preg_match ( '~[^\x00-\x7F]~' , $ value ) ) { $ encoding = '7bit' ; } elseif ( preg_match_all ( '/[\000-\010\013\014\016-\037\177-\377]/' , $ value ) > ( strlen ( $ value ) / 3 ) ) { $ encoding = 'base64' ; } else { $ encoding = 'quoted-printable' ; } $ encodedName = Mime :: encode ( $ value , $ encoding , $ wrapWidth , $ folding , true ) ; $ value = trim ( str_replace ( [ "\r" , "\n" ] , '' , $ value ) ) ; if ( $ encoding === 'base64' ) { $ encodedName = "=?UTF-8?B?{$encodedName}?=" ; } elseif ( $ encoding === 'quoted-printable' ) { $ encodedName = "=?UTF-8?Q?{$encodedName}?=" ; } else { $ encodedName = addcslashes ( $ encodedName , "\0..\37\177\\\"" ) ; if ( $ encodedName !== $ value || preg_match ( '/[^A-Za-z0-9!#$%&\'*+\/=?^_`{|}~ -]/' , $ value ) === 1 ) { $ encodedName = sprintf ( '"%s"' , $ encodedName ) ; } } return $ encodedName ; }
MIME-encode a value to its mots suitable format

@param  string $value The value to encode.
@return string        Returns the encoded value.
MIME - encode a value to its mots suitable format