PHP解析RSS源

Question

I am going to a url, which is just an rss feed, and now I would like to parse the code to return certain bits of information (image urls). I've gotten as far as finding where my information starts but I can not figure out how to read until my delimiting character; which is a ". I would ultimately like to the image urls saved to a text file that my iphone app can reference.

Basically, I want to go to the url.. scan the html code for the image urls that are posted, and return it to a text file.

Here is my current code

     <?php

    $url = 'http://www.actionsportsinc.com/p200285048/recent.rss';

$data = file_get_contents( $url );

// just a test to compare with RSS to see whats being pulled
$file = 'iphoneApp.txt';

// Write the contents back to the file
file_put_contents($file, $data);



if(strpos($data, '<media:content url="') !== FALSE)
{

    $url = "";
    while (! feof($file) && (fgetc($file) != '"')) {
        $url = $url . fgetc($file);
    }

        echo $url; // just trying to print out one url right now to make sure it is actually working... would like to scan entire rss until EOF

}


?>

Here is an example of the rss looks like

<media:content url="http://www.actionsportsinc.com/img/s12/v173/p468059272-4.jpg" type="image/jpeg" medium="image" width="800" height="533"/>
<media:title>D1411HMSF134189JRN</media:title>

I would appreciate any suggestions you all may have. Thank you!

Answer 1

$pos = 0
while($x = strpos($data, '<media:content url="', $pos) !== FALSE)
{
    $y = strpos($data, '" type="', $pos)
    $imgurl = substr($data, $x+'num of chars in <media:content url="', $y); 
    $pos = $x
    //write imgurl to whatever file you like
}

untested code I am sure there are syntax issues with it but should give you want you need to do it if you do not want to use an xml parser thats already been made

what that is going for is iterating through $data starting at $pos if it finds an instance of

Once it has both those positions itll substr and you need to pull from $data $x(start position of media:content)+ number of chars in your search param and $y start position of the end of the url...

edit- apparently it do didnt like the $x in there like that so

$url = 'http://www.actionsportsinc.com/p200285048/recent.rss';

$data = file_get_contents( $url );
$pos = 0;
while(strpos($data, '<media:content url="', $pos) !== FALSE)
{
    $x = strpos($data, '<media:content url="', $pos) ;
    $y = strpos($data, ' type="image', $x);
    $imgurl = substr($data, $x+20, $y - 49 - $x); 
    $pos = $x + 1;
    echo $imgurl . "|| <br>";
    //write imgurl to whatever file you like
}

That is the exact code pasted straight from my npp