How to stop php loop on time?

Question

PHP

The while loop is executed
Inside it is $object=simplexml_load_file($i);
where $i=" site.ru/file.xml "
sometimes the site blunts and does not return xml and the script freezes.
How to reveal it? Is it possible to stop the loop if it "hangs" for N seconds?

Answer 1

Divide the task into simple steps. So that at each step you can catch errors and process them:

1. Download file php.net/manual/en/book.curl.php
   
2. Parsing XML php.net/manual/ru/book.simplexml.php
   

Answer 2

only by script timeout php.net/manual/ru/function.set-time-limit.php
or like this:

function simplexml_load_file_from_url($url, $timeout = 5){
  
  $context = array('http' => array('timeout' => (int)$timeout));
  
  $data = file_get_contents($url, false, $context);
  
  if(!$data){
    trigger_error('Cannot load data from url: ' . $url, E_USER_NOTICE);
    return false;
  }
  
  return simplexml_load_string($data);
}

Answer 3

If this is a sitemap, break it into several parts

<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<sitemap>
<loc>http://site.com/sitemap/part1.xml</loc>
</sitemap>
<sitemap>
<loc>http://site.com/sitemap/part2.xml</loc>
</sitemap>
</sitemapindex>

Answer 4

It's better to use XmlReader to traverse the tree structure and simplexml to read nodes so you can read large xml without the need for memory consuming script.
(In practice, I used it when parsing YML product catalogs of 2GB + file, the average value of memory consumption is 16-17MB.)
XmlReader reads the document on the fly without loading the tree into the operative
simplexml reads the file into the operative then parses ...

function getSimpleXMLInstance($xml_reader)
 {
        $doc = new DOMDocument('1.0', 'UTF-8');
        return simplexml_import_dom($doc->importNode($xml_reader->expand(), true));
    }
//....

        $xml_reader = new XMLReader();
        $reader = $xml_reader;
        $reader->open($catalog->yml_catalog_url)
        while ($reader->read())
        {
 if ($reader->nodeType == XMLReader::ELEMENT && $reader->name == 'sitemap')
            {
                try
                {
                   // тут simplexml
                   $simpleXmlObject = getSimpleXMLInstance($reader);
                }
                catch (Exception $e)
               {
                    continue;
                }
            }
        }

TS, file size in MB?