syntax error, unexpected '<'

        $_html .= '<a href="' . $relative_path . '" target="_blank" style="display:block; margin-bottom:5px;">查看</a>';
        $_html .= '<button onclick="printFile(\'' . basename($relative_path) . '\')">打印</button>';
        $_html .= '</td>';
    } else {
        $_html .= '<td><span style="color: red;">文件不存在</span></td>';
    }
}


<script>
function printFile(fileName) {
    var iframe = document.createElement("iframe");
    iframe.style.position = "absolute";
    iframe.style.width = "0px";
    iframe.style.height = "0px";
    iframe.style.border = "none";
    iframe.src = "/data/upload/LBPI70obhjsmAOy/24062505/" + fileName;
    document.body.appendChild(iframe);
    iframe.contentWindow.print();