How can I find an xml string using php in this case? - php

Question

I want my php-script to download files from a specific link based on xml id's. I want it to ignore the rest of the xml-code, I want it to just look at the first id of every lib.
My xml looks like this:
**
<lib id="ITEM_I_WANT_TO_DOWNLOAD_1" revision="0000">
<part id="0000" type="ch"/>
<part id="0000" type="ls"/>
<part id="0000" type="rs"/>
<part id="0000" type="ch"/>
</lib>
<lib id="ITEM_I_WANT_TO_DOWNLOAD_2" revision="0000">
<part id="0000" type="ch"/>
<part id="0000" type="ls"/>
<part id="0000" type="rs"/>
<part id="0000" type="ch"/>
</lib>
**
My current PHP-script looks like this:
if (!defined('STDIN'))
{
echo 'Please run it as a cmd ({path to your php}/php.exe {path to badges.php} -f)';
exit;
}
define('BASE', 'https://randomtarget.com/');
$figuremap = get_remote_data('https://random/xmlfile-needed.xml/');
if (!file_exists('C:/outputfolder/')) {
mkdir('C:/outputfolder/', 0777, true);
echo "\n --------------> Output folder has been made... \n";
sleep(3);
$fp = fopen("C:/downloaded-xmlfile.xml", "w");
fwrite($fp, $figuremap);
fclose($fp);
echo "\n --------------> XML downloaded and placed into folder \n";
sleep(3);
}
$pos = 0;
while ($pos = strpos($figuremap, '<lib id="', $pos +1))
{
$pos1 = strpos($figuremap, '"', $pos);
$rule = substr($figuremap, $pos, ($pos1 -$pos));
$rule = explode(',', $rule);
$revision = str_replace('">', '', $rule[1]);
$clothing_file = current(explode('*', str_replace('"', '', $rule[2])));
if (file_exists('C:/outputfolder/'.$clothing_file.'.swf'))
{
echo 'Clothing_file found: '.$clothing_file."\r\n";
continue;
}
echo 'Download clothing_file: '.$clothing_file.' '.$revision."\r\n";
if (!#copy(BASE.'/'.$revision.'/'.$clothing_file.'.swf', 'C:/outputfolder'.$clothing_file.'.swf'))
{
echo 'Error downloading: '.$clothing_file."\r\n";
}
}
Beside this code I wrote a get_remote_data function so that's allright. I just want the strpos to grab all the id='' items to check if the files exist on the target-site.
How can I fix it?

Answer 1

There are some easy ways of processing XML files, the easiest (but less flexible) is SimpleXML, the following code should replace the main processing loop...
$xml = simplexml_load_string($figuremap);
foreach ( $xml->lib as $lib ) {
$clothing_file = (string) $lib['id'];
if (file_exists('C:/outputfolder/'.$clothing_file.'.swf'))
{
echo 'Clothing_file found: '.$clothing_file."\r\n";
continue;
}
echo 'Download clothing_file: '.$clothing_file.' '.$revision."\r\n";
if (!#copy(BASE.'/'.$revision.'/'.$clothing_file.'.swf', 'C:/outputfolder'.$clothing_file.'.swf'))
{
echo 'Error downloading: '.$clothing_file."\r\n";
}
}
The start point is to load the XML you have in $figuremap into SimpleXML, then to loop over the elements. This assumes an XML structure of something like...
<lib1>
<lib id="ITEM_I_WANT_TO_DOWNLOAD_1" revision="0000">
<part id="0000a" type="ch" />
<part id="0000" type="ls" />
<part id="0000" type="rs" />
<part id="0000" type="ch" />
</lib>
<lib id="ITEM_I_WANT_TO_DOWNLOAD_2" revision="0000">
<part id="00001" type="ch" />
<part id="0000" type="ls" />
<part id="0000" type="rs" />
<part id="0000" type="ch" />
</lib>
</lib1>
The actual name of the base element doesn't matter as long as the <lib> elements are 1 level down then you can use $xml->lib to loop over them.

Answer 2

Your posted xml string is actually invalid. It needs to be wrapped in a parent element to be repaired. I'm not sure if you are posting your exact xml string or just a section of it.
$xml = '<lib id="ITEM_I_WANT_TO_DOWNLOAD_1" revision="0000">
<part id="0000" type="ch"/>
<part id="0000" type="ls"/>
<part id="0000" type="rs"/>
<part id="0000" type="ch"/>
</lib>
<lib id="ITEM_I_WANT_TO_DOWNLOAD_2" revision="0000">
<part id="0000" type="ch"/>
<part id="0000" type="ls"/>
<part id="0000" type="rs"/>
<part id="0000" type="ch"/>
</lib>';
$xml = '<mydocument>' . $xml . '</mydocument>'; // repair invalid xml
https://stackoverflow.com/q/4544272/2943403
$doc = new DOMDocument();
$doc->loadXml($xml);
$xpath = new DOMXpath($doc);
foreach ($xpath->evaluate('//lib/#id') as $attr) {
$clothing_file = $attr->value;
// perform your conditional actions ...
}
//lib/#id says search for the id attribute of all <lib> elements, anywhere in the document.