PHP cURL to return remote page stylesheets

Question

I'm using following code to get remote content using PHP cURL

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://example.com");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);
curl_close($ch);
echo $output;

This code returns whole content But I just want to print all stylsheets in following format.

<link rel="stylesheet" href="http://www.example.com/css/style1.css">
<link rel="stylesheet" href="http://www.example.com/css/style2.css">

How do I Filter content using str.replace() to only get stylsheets with cURL?

score 2 · Answer 1 · edited May 23 '17 at 10:34

If you only want to leave the <link> elements intact then you can use PHP's strip_tags() function.

strip_tags — Strip HTML and PHP tags from a string

It accepts an additional parameter that defines allowed tags, so all you have to do is set the only allowed tag to be the <link> tag.

$output = curl_exec($ch);
$linksOnly = strip_tags($ouput,'link');

The main problem here is that you don't really know what content you are going to get and trying to parse HTML content with anything other than a tool designed for that task may leave you with grey hair and a nervious twitch ;)

References -

strip_tags()

score 1 · Answer 2 · answered Aug 27 '12 at 09:56

1

A better approach would be to use PHP DOM to parse the HTML tree and retrieve the required nodes - <link> in your case - and filter them appropriately.

answered Aug 27 '12 at 09:56

WeaklyTyped

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score 1 · Answer 3 · answered Aug 27 '12 at 09:57

1

Using a regex:

preg_match_all('/rel="stylesheet" href="(.*)">/', $output, $matches);

if (isset($matches[1]) && count($matches[1]))
{
  foreach ($matches as $value)
  {
    echo '<link rel="stylesheet" href="'.$value.'">';
  }
}

answered Aug 27 '12 at 09:57

j0k

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what if my site has ``? I think the regex has a few caveats. – Berry Langerak Aug 27 '12 at 10:05
Well I can't agree more, but OP doesn't provide any output example. `href` can also be before the `rel`. – j0k Aug 27 '12 at 10:09
Which is why people say you shouldn't use a regular expression to parse HTML, I reckon ^_^ Ah well, it does answer the question, so +1. – Berry Langerak Aug 27 '12 at 10:10

Prasanth · Accepted Answer · 2012-08-27T10:15:46.877

1

Using simple html dom library,

include('simple_html_dom.php');

// get DOM from URL or file
$html = file_get_html('http://www.example.com/');
// or your can get $html string through your curl request and say
// $html = str_get_html($html);

// find all "link"
foreach($html->find('link') as $e) {
    if($e->type="text/css" && strpos($e->href, ":/") !=== false) // you don't want relative css hrefs. right?
    echo $e->href."<br>";
}

edited Aug 27 '12 at 10:15

answered Aug 27 '12 at 10:00

Prasanth

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It might be interesting to know from where the `simple_html_dom.php` comes. – j0k Aug 27 '12 at 10:10

PHP cURL to return remote page stylesheets

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