specifics replace substring in string with php function

Question

in the text, i would like to replace the div tag li. But not everyone just certain well defined. In this case, those that have id that begins "tab-*" I need something using PHP functions easily from text:

<div id="tab-141285" class="my-class">                         
  <div class="my-subclass">              
    <div>                     
     Lorem ipsum dolor sit amet consectetuer                 
    </div>             
  </div>                 
</div>                   
<div id="tab-85429"  class="my-class">                                  
  <div class="my-subclass">              
    <div>                      
    Lorem ipsum dolor sit amet consectetuer                  
    </div>             
  </div>                 
</div>

get this text

<li id="tab-141285" class="my-class">                          
  <div class="my-subclass">              
    <div>                     
     Lorem ipsum dolor sit amet consectetuer                 
    </div>             
  </div>                 
</li>                
<li id="tab-85429"  class="my-class">                                   
  <div class="my-subclass">              
    <div>                      
    Lorem ipsum dolor sit amet consectetuer                  
    </div>             
  </div>                 
</li>

Can you advise me?

Thank you

Where's the code you've tried? I see nothing preg_replace related. — l'L'l
– l'L'l, Commented Oct 10, 2014 at 6:20
I would advise against a pritive substring replacement approach. Though this is possible it carries a certain risk that things break the moment the markup is not implemented exactly as expected. Instead you should take a look at a php based DOM parser and manipulator. — arkascha
– arkascha, Commented Oct 10, 2014 at 6:39

user3942918 · Accepted Answer · 2014-10-10 09:11:47Z

1

Regular expressions are not adequate for parsing HTML. Any regex you try to use will be fragile. I suggest using the DOM extension for this instead.

The idea is to:

Find all the <div> elements that have an id attribute that begins with "tab-" using the XPath query //div[starts-with(@id, "tab-")]
Create a new <li> element for each of them.
Move all the <div>'s attributes and child nodes to the new <li> element.
Replace the old <div> with the new <li>.

Because your string doesn't have a root element, we'll do a little dance before and after to put it in one then rebuild it.

Example:

$html = <<<'HTML'
<div id="tab-141285" class="my-class">
  <div class="my-subclass">
    <div>
     Lorem ipsum dolor sit amet consectetuer
    </div>
  </div>
</div>
<div id="tab-85429"  class="my-class">
  <div class="my-subclass">
    <div>
    Lorem ipsum dolor sit amet consectetuer
    </div>
  </div>
</div>
HTML;

$dom = new DOMDocument();
$dom->loadHTML("<div>$html</div>", LIBXML_HTML_NOIMPLIED);
$xpath = new DOMXPath($dom);

$nodes = $xpath->query('//div[starts-with(@id, "tab-")]');

foreach ($nodes as $node) {
    $li = $dom->createElement('li');

    while ($node->attributes->length) {
        $li->setAttributeNode($node->attributes->item(0));
    }
    while ($node->firstChild) {
        $li->appendChild($node->firstChild);
    }

    $node->parentNode->replaceChild($li, $node);
}

$html = '';
foreach ($dom->documentElement->childNodes as $node) {
    $html .= $dom->saveHTML($node);
}

echo $html;

Output:

<li id="tab-141285" class="my-class">
  <div class="my-subclass">
    <div>
     Lorem ipsum dolor sit amet consectetuer
    </div>
  </div>
</li>
<li id="tab-85429" class="my-class">
  <div class="my-subclass">
    <div>
    Lorem ipsum dolor sit amet consectetuer
    </div>
  </div>
</li>

answered Oct 10, 2014 at 9:11

user3942918

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2 Comments

user3061527 Over a year ago

Thank you, This is what I wanted. I was just there at the end instead of added echo $html; echo preg_replace ('/(<\/?body>)|(<\/?html>)/i', '', $ html);

user3061527 Over a year ago

Hi, after all I still have one question. Why is $dom->loadHTML("<div>$html</div>", LIBXML_HTML_NOIMPLIED); and not $dom->loadHTML($html, LIBXML_HTML_NOIMPLIED);

Sagar Rabadiya · Accepted Answer · 2014-10-10 07:16:27Z

0

use domdocument xml component of php just load the string in domdocument object and search for element then get its attribute and check its id and compare using preg_replace and remove if it met your condition

answered Oct 10, 2014 at 7:16

Sagar Rabadiya

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1 Comment

user3061527 Over a year ago

How it should look like?

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