file_get_content in specific part of sitemap content

You can use regex with preg_match_all like this: / p>

<?php

$dados = file_get_contents('https://www.site.com.br/sitemap.xml');

if (preg_match_all('#www\.site\.com\.br/numero/([^/]+)/#', $dados, $matches)) {
    $matches = $matches[1];

    foreach ($matches as $value) {
        echo $value, '<br>', PHP_EOL;
    }
}

The #www\.site\.com\.br/numero/([^/]+)/# is the regex, the points have \ in front to escape, because the point matches any character (less line break), which is within ([^/]+) in the case of [^/] indicates that preg_match_all takes any character except / , in this way it will extract everything that comes after www.site.com.br/numero/ and before the next bar.

• A little about regex: link
• link

Example on IDEONE

XML

Now if you are using XML and this:

www.site.com.br/numero/123/www.site.com.br/numero/124/www.site.com.br/numero/125/

In fact it is the view of your browser that did not render the "XML", so the preg_match and nor substr will work, assuming your Xml (if it's even an xml) is more or less like this :

<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
   <url>
      <loc>http://www.site.com.br/numero/123/</loc>
      <lastmod>2005-01-01</lastmod>
      <changefreq>monthly</changefreq>
      <priority>0.8</priority>
   </url>
   <url>
      <loc>http://www.site.com.br/numero/124/</loc>
      <lastmod>2005-01-01</lastmod>
      <changefreq>monthly</changefreq>
      <priority>0.8</priority>
   </url>
   <url>
      <loc>http://www.site.com.br/numero/125/</loc>
      <lastmod>2005-01-01</lastmod>
      <changefreq>monthly</changefreq>
      <priority>0.8</priority>
   </url>
   <url>
      <loc>http://www.site.com.br/numero/126/</loc>
      <lastmod>2005-01-01</lastmod>
      <changefreq>monthly</changefreq>
      <priority>0.8</priority>
   </url>
</urlset>

Then you can use DOM or simplexml_load_file (or simplexml_load_string ), in this case using < in> simplexml :

<?php

$urlset = simplexml_load_file('sitemap.xml');

foreach($urlset as $url) {
    if (preg_match('#www\.site\.com\.br/numero/([^/]+)/#', $url->loc, $match)) {
        $numeros[] = $match[1];
    }
}

foreach ($matches as $value) {
    echo $value, '<br>', PHP_EOL;
}

With $url->loc you get the value of the <loc> tag, if your XML may have a different format, just change ->loc by the tag name you use.

Example on IDEONE

This will only work if sitemap content is really in the structure of your example. But if you are different you will have to adapt the code.

<?php
$sitemap = file_get_contents('https://www.site.com.br/sitemap.xml');
$lista = array();
$key = 0;
while (strpos($sitemap,'/numero/') > 0) {
    $sitemap = substr($sitemap,strpos($sitemap,'/numero/')+8);
    $lista[$key] = substr($sitemap,0,strpos($sitemap,'/'));
    $key++;
}
/* Aqui você já tem o Array $lista com a seguinte estrutura:
array(3) {
  [0]=>
  string(3) "123"
  [1]=>
  string(3) "124"
  [2]=>
  string(3) "125"
}
*/

//Percorrendo o Array para obter o valor de cada chave...
foreach($lista as $key => $value) {
    echo $value.'<br/>';
}
?>

We can make use of a function whose purpose is to extract 3 characters after finding the position by which the extraction should begin.

function esquerda($str, $length) {
   return substr($str, 0, $length);
}

$url = file_get_contents('https://www.site.com.br/sitemap.xml');

while (strpos($url,'/numero/') > 0) {
    $url = substr($url,strpos($url,'/numero/')+8);
    echo esquerda($url, 3);
    echo "<br>";
}

DOCS:

• User Defined Functions
• while
• strpos
• substr