格式化PHP simpleXML文件

Question

Im creating simple PHP code to generate sitemap.xml file, but the problem is, that the file is unformatted. If the file was smaller, I could look at it in browser, but it has about 1,5 MB and Chrome just gives up while loading it (IE loads it and you can view it, but its lagging really hard).

I googled and tried different solutions (even from this site), but none of them worked, so Im humbly asking for your help. Also Im using the newest PHP version and my server runs on Unix based OS if thats important.

Here is code Im using (there are couple thousands (15.000+) rows in the table, so XML file is pretty long:

$xml = '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">';

$xml .= "<url>";
$xml .= "<loc>MY.URL.COM/</loc>";
$xml .= "<changefreq>always</changefreq>";
$xml .= "<priority>1.00</priority>";
$xml .= "</url>";

$xml .= "<url>";
$xml .= "<loc>MY.URL.COM/upload.php</loc>";
$xml .= "<changefreq>weekly</changefreq>";
$xml .= "<priority>0.80</priority>";
$xml .= "</url>";

$select = dbquery("SELECT * FROM MY TABLE");
while ($data = dbarray($select)) {
    $xml .= "<url>";
    $xml .= "<loc>MY.URL.COM/?id=".$data['id']."</loc>";
    $xml .= "<changefreq>daily</changefreq>";
    $xml .= "<priority>0.50</priority>";
    $xml .= "</url>";
}

$xml .= '</urlset>';

$sxml = new SimpleXMLElement($xml);

$dom = new DOMDocument('1.0');
$dom->formatOutput = true;
$dom->loadXML($sxml->asXML());
$dom->saveXML("sitemap.xml");

Also, every time after new page is added Im running this code to append it to sitemap file and its appending it into one row, so need to fix that too. Im trying both codes separately, so Im sure the first one doesnt format the document at all.

$sitemap = simplexml_load_file("sitemap.xml");
$url = $sitemap->addChild('url');
$url->addChild("loc", "MY.URL.COM/?id=".$get_id['id']);
$url->addChild("changefreq", "daily");
$url->addChild("priority", "0.50");
$sitemap->asXML("sitemap.xml");

By Unreadable I mean its saved in one line like this:

<?xml version="1.0"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
<url><loc>MY.URL.COM?id=1</loc><changefreq>daily</changefreq><priority>0.50</priority></url><url><loc>MY.URL.COM?id=2</loc><changefreq>daily</changefreq><priority>0.50</priority></url><url><loc>MY.URL.COM?id=5</loc><changefreq>daily</changefreq><priority>0.50</priority></url><url><loc>MY.URL.COM?id=7</loc><changefreq>daily</changefreq><priority>0.50</priority></url></urlset>

Instead of:

<?xml version="1.0"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
    <url>
        <loc>MY.URL.COM?id=1</loc>
        <changefreq>daily</changefreq>
        <priority>0.50</priority>
    </url>
    <url>
        <loc>MY.URL.COM?id=2</loc>
        <changefreq>daily</changefreq>
        <priority>0.50</priority>
    </url>
    <url>
        <loc>MY.URL.COM?id=5</loc>
        <changefreq>daily</changefreq>
        <priority>0.50</priority>
    </url>
    <url>
        <loc>MY.URL.COM?id=7</loc>
        <changefreq>daily</changefreq>
        <priority>0.50</priority>
    </url>
</urlset>

**

WORKING CODE:

**

$xml = "<urlset xmlns='http://www.sitemaps.org/schemas/sitemap/0.9' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd'>";

$select = dbquery("SELECT * FROM MY TABLE");
while ($data = dbarray($select)) {
    $xml .= "<url>";
    $xml .= "<loc>MY.URL.COM/?id=".$data['id']."</loc>";
    $xml .= "<changefreq>daily</changefreq>";
    $xml .= "<priority>0.50</priority>";
}

$xml .= '</urlset>';
$sitemap = simplexml_load_file($xml);
$sxe = new SimpleXMLElement($xml);

$dom = new DOMDocument('1.0');
$dom->preserveWhiteSpace = false;
$dom->formatOutput = true;
$dom->loadXML($xml);
$dom->save("sitemap.xml");

Code to append to existing xml file:

$sitemap = simplexml_load_file("sitemap.xml");
$url = $sitemap->addChild('url');
$url->addChild("loc", "MY.URL.COM/?id=".$get_id['id']);
$url->addChild("changefreq", "daily");
$url->addChild("priority", "0.50");

$dom = new DOMDocument('1.0');
$dom->preserveWhiteSpace = false;
$dom->formatOutput = true;
$dom->loadXML($sitemap->asXML());
$dom->save('sitemap.xml');

Answer 1

要查看的另一件事是，如果运行代码的服务器是Unix / Linux，它将使用Unix行尾（LF），如果在Windows编辑器或浏览器中查看，则可能无法正确显示（CR-LF）。

Answer 2

Edit Start

//you don't need simplexml
// $sxml = new SimpleXMLElement($xml);

$dom = new DOMDocument('1.0');
$dom->formatOutput = true;
$dom->loadXML($xml); // can use the xml string
$dom->save("sitemap.xml"); // need to use save() rather than saveXML

Edit End

The code that you have written for the first time will do a proper formatting. Problem will arise when you add a new element/node to sitemap.xml using simplexml.

If you want a properly formatted XML, you will need to save it using DOMDocument every time, the same one that you are doing initially.

What you are doing

$sitemap = simplexml_load_file("sitemap.xml");
$url = $sitemap->addChild('url');
$url->addChild("loc", "MY.URL.COM/?id=".$get_id['id']);
$url->addChild("changefreq", "daily");
$url->addChild("priority", "0.50");
$sitemap->asXML("sitemap.xml");

Try changing it to this:

$sitemap = simplexml_load_file("sitemap.xml");
$url = $sitemap->addChild('url');
$url->addChild("loc", "MY.URL.COM/?id=".$get_id['id']);
$url->addChild("changefreq", "daily");
$url->addChild("priority", "0.50");

$dom = new DOMDocument('1.0',LIBXML_NOBLANKS);
$dom->formatOutput = true;
$dom->loadXML($sitemap->asXML());
$dom->saveXML('sitemap.xml');

Hope it helps.