How to append the text (increasing order) using DOM parser in PHP?

Question

How to append the text (increasing order) using DOM parser in PHP?

109 views Asked by Learning At 30 October 2024 at 22:17

$html='<h1 class="title">Exponents[label*exponents]</h1>
<h2 class="title">Exponents[label*exponents]</h2>
<h2 class="title">Exponents[label*exponents]</h2>
<h1 class="title">Exponents[label*exponents]</h1>
<h2 class="title">Exponents[label*exponents]</h2>
<h2 class="title">Exponents[label*exponents]</h2>
<h2 class="title">Exponents[label*exponents]</h2>
<h3 class="title">Exponents[label*exponents]</h3>
<h1 class="title">Exponents[label*exponents]</h1>
<h1 class="title">Exponents[label*exponents]</h1>
<h2 class="title">Exponents[label*exponents]</h2>';

Expected output:

<h1 class="title">1.1 Exponents[label*exponents]</h1>
<h2 class="title">1.1.1 Exponents[label*exponents]</h2>
<h2 class="title">1.1.2 Exponents[label*exponents]</h2>
<h1 class="title">1.2 Exponents[label*exponents]</h1>
<h2 class="title">1.2.1 Exponents[label*exponents]</h2>
<h2 class="title">1.2.2 Exponents[label*exponents]</h2>
<h2 class="title">1.2.3 Exponents[label*exponents]</h2>
<h3 class="title">1.2.3.1 Exponents[label*exponents]</h3>
<h1 class="title">1.3 Exponents[label*exponents]</h1>
<h1 class="title">1.4 Exponents[label*exponents]</h1>
<h2 class="title">1.4.1 Exponents[label*exponents]</h2>;

For example, if the append text is 1.1 then first 1 is chapter no. and second 1 is first occurrence of h1, if it is 1.2.2 then it is chapter no. then second occurrence of h1 and second occurrence of h2. As I'm learning DOM parser class I have tried something like this below,

$dom = new DOMDocument;
$dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);

$xp = new DOMXPath($dom);
$xp->registerNamespace("php", "http://php.net/xpath");
$className="title";
$hElement = $xp->query("//*[contains(@class, '$className')]");
$chapno=1;
$h1=0;
$h2=0;
$h3=0;
$h4=0;

foreach($hElement as $hNode) {
     if($hElement==="h1"){
         $h1++;
         $append="$chapno.$h1 ";
         $hnode->nodeValue =$append.$hNode->textContent;
         $h2=0;$h3=0;$h24=0;         
     }
     if($hElement==="h2"){
         $h2++;
         $append="$chapno.$h1.$h2 ";
         $hnode->nodeValue =$append.$hNode->textContent;
     }

     if($hElement==="h3"){
         $h3++;
         $append="$chapno.$h1.$h2.$h3 ";
         $hnode->nodeValue =$append.$hNode->textContent;
     }

     if($hElement==="h4"){
         $h4++;
         $append="$chapno.$h1.$h2.$h3.$h4 "; 
         $hnode->nodeValue =$append.$hNode->textContent;
     }           
}

I don't know whether it is correct approach to get my expected output and if it is correct,I don't know how to do further.

Original Q&A

There are 1 answers

**splash58** · Accepted Answer · 2015-06-09 12:37:43

I simplify your code, and then was able to understand it. I hope all is clear.

$dom = new DOMDocument;
$dom->loadHTML($html);

$xp = new DOMXPath($dom);
$xp->registerNamespace("php", "http://php.net/xpath");
$className="title";
$hElement = $xp->query("//*[contains(@class, '$className')]");
$chapno=1;
$h = array(0, 0, 0, 0); 

foreach($hElement as $hNode) {
    if ($hNode->nodeName[0] === 'h') {     // 1st letter is tag name
       $i =  $hNode->nodeName[1];          // level number 

       $h[$i-1]++;                         // increase counter of level
       $append = $chapno.".".implode('.', array_slice($h, 0, $i));
       while($i < count($h)) $h[$i++] = 0; // set lower levels with start value 
       $hNode->nodeValue = $append." ".$hNode->nodeValue;  // Don't forget to change title text
    }
}   

echo $dom->saveHTML();

result

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body><h1 class="title">1.1 Exponents[label*exponents]</h1>
<h2 class="title">1.1.1 Exponents[label*exponents]</h2>
<h2 class="title">1.1.2 Exponents[label*exponents]</h2>
<h1 class="title">1.2 Exponents[label*exponents]</h1>
<h2 class="title">1.2.1 Exponents[label*exponents]</h2>
<h2 class="title">1.2.2 Exponents[label*exponents]</h2>
<h2 class="title">1.2.3 Exponents[label*exponents]</h2>
<h3 class="title">1.2.3.1 Exponents[label*exponents]</h3>
<h1 class="title">1.3 Exponents[label*exponents]</h1>
<h1 class="title">1.4 Exponents[label*exponents]</h1>
<h2 class="title">1.4.1 Exponents[label*exponents]</h2></body></html>

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How to append the text (increasing order) using DOM parser in PHP?

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