php 一行太长怎么办

<?php
$requestPage = $_REQUEST[&#39;page&#39;];
if ("ipConfig" == $requestPage)
{
    $json = &#39;{
                "mac-address": "00:04:A3:22:18:FD",
                "host-name": "TRIAD",
                "dhcp-enable": "1",
                "ip-address": "192.168.200.40",
                "gateway": "192.168.200.254",
                "sub-mask": "255.255.255.0",
                "primary-dns": "192.168.200.2",
                "secondary-dns": "192.168.200.8"
             }&#39;;
}
echo $json;
?>