Problems with multiple attributes while using PHP

问题:

I use this code for getting elements of left navigation bar:

function parseInit($url) {
  $ch = curl_init();
  $timeout = 0;
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);     
  curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2); 
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
  $data = curl_exec($ch);
  curl_close($ch);
  return $data;
}

$data = parseInit("https://www.smile-dental.de/index.php");
$data = preg_replace('/<(d[ldt])( |>)/smi', '<div data-type="$1"$2', $data);
$data = preg_replace('/<\/d[ldt]>/smi', '</div>', $data);
$html = new simple_html_dom();
$html = $html->load($data);

But faced with such problem.
For example, if I use such syntax for getting elements: $html->find("div[data-type=dd].level2"), then I get ALL elements with data attributes DT, DD, DL and class name LEVEL2. If I use another syntax: $html->find("div.level2[data-type=dd]"), then I get ALL elements with data attribute DD, but with class names LEVEL1, LEVEL2 and LEVEL3 etc.. Could you explain me what the problem is? Thanks in advance!

P.S.: All DT, DL and DD elements was changed with regexp to the DIV elements with appropriate data attributes, because this parser incorrectly counts the number of these elements.

回答1:

REGEXes are not made to manipulate HTML, DOM parsers are... And simple_html_dom you're using can do it easily...

The following code will do what you want just fine (check comments):

$data = parseInit("https://www.smile-dental.de/index.php");

// Create a DOM object
$html = new simple_html_dom();
$html = $html->load($data);

// Find all tags to replace
$nodes = $html->find('td, dd, dl');

// Loop through every node and make the wanted changes
foreach ($nodes as $key => $node) {
    // Get the original tag's name
    $originalTag = $node->tag;

    // Replace it with the new tag
    $node->tag = 'div';

    // Set a new attribute with the original tag's name
    $node->{'data-type'} = $originalTag;
}
// Clear DOM variable
$html->clear();
unset($html);

Here's is it in action

Now, for multiple attributes filtering, you can use either of the following methods:

foreach ( $html->find("div.level2") as $key => $node) {
    if (  $node->{'data-type'} == 'dt' ) {
        # code...
    }
}

OR (courtesy to h0tw1r3):

// array containing all the filtered nodes
$dts = array_filter($html->find('div.level2'), function($node){return $node->{'data-type'} == 'dt';});

Please read the MANUAL for more details...