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<?php $preferences = array( 'scheme' => 'Q', 'input-charset' => 'utf-8', 'output-charset' => 'utf-8', 'line-length' => 74, 'line-break-chars' => "\r\n", ); // Note the ellipsis character at the end of the following string: var_dump(iconv_mime_encode('subject', "d obeybiubrsfqllpdtpge…", $preferences));

preferences:
48.84 ms | 402 KiB | 5 Q