自动生成和替换站点地图

Question

I am trying to automatically replace my sitemap file on the server. Using php and mysqli, I generate the required output, but I cannot work out how to save that output as a .xml file.
I've read about creating, opening and writing files with php, but I cannot work out how to take my generated content and get it into a file. Any pointers please?

Here is my code so far...

 $my_file = 'sitemap.xml'; $handle = fopen($my_file, 'w') or die('Cannot open file: '.$my_file); $data=""; //how do I include the code below as my 'data'? <?php echo"<?xml version=\\"1.0\\" encoding=\\"utf-8\\" ?>"; ?> <?php include "connectScript.php"; $date = date("Ymd"); header("Content-type: text/xml"); ?> <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"> <?php $baseUrl="mysite.co.uk/page.php"; $query = "SELECT DISTINCT topic FROM db"; $result = $conn->query($query) or die (mysql_error($query)); while($row = $result->fetch_assoc()) { $topic = $row['topic']; $topic = "$baseUrl?t=${topic}"; ?> <url> <loc>http://www.<?php echo $topic; ?></loc> <lastmod><?php echo $date; ?></lastmod> <changefreq>daily</changefreq> <priority>1.00</priority> </url> <?php } ?> </urlset> <?php fwrite($handle, $data); ?> 

Answer 1

Try something like this:

$my_file = 'sitemap.xml';
$handle = fopen($my_file, 'w') or die('Cannot open file:  '.$my_file);
$data=""; //how do I include the code below as my 'data'?

<?php ob_start();?>  //start the output buffer

<?php echo"<?xml version=\"1.0\" encoding=\"utf-8\" ?>"; ?>
<?php 
include "connectScript.php";
$date = date("Y-m-d");
//header("Content-type: text/xml");//remove this, this isn't an xml file it's a php file creating xml
?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<?php
$baseUrl="mysite.co.uk/page.php";
$query = "SELECT DISTINCT topic FROM db";
$result = $conn->query($query) or die (mysql_error($query));
while($row = $result->fetch_assoc()) {
$topic = $row['topic'];
$topic = "$baseUrl?t=${topic}";
?>
<url>
<loc>http://www.<?php echo $topic; ?></loc>
<lastmod><?php echo $date; ?></lastmod>
<changefreq>daily</changefreq>
<priority>1.00</priority>
</url>
<?php
}
?>
</urlset>

<?php
$data = ob_get_clean();  // set everything that was output above to the $data variable
fwrite($handle, $data);
?>

Answer 2

There are a few ways to save data to a file, one of the most simple ones being (as quoted from the manual)

int file_put_contents ( string $filename , mixed $data [, int $flags = 0 [, resource $context ]] )

Which is just a simplified version of fopen/fwrite/fclose. It does however write a string as you had noticed.

Getting things in a string

Option A

Building a string can be done by using:

$string = "Hello I'm a string.";

To append more you can use

$string = $string . " And I'm another part.";

Or the shorter version using an assignment operator :

$string .= " And I'm another part.";

Option B

It is also possible to buffer any output (things printed (print()/echo/etc.) using ob_start like so:

ob_start();

echo "Hello i'm a string.";
echo "And I'm another part.";
// do whatever more you need.

$content = ob_get_clean();
file_put_contents('file.txt', $content);