Count number of <li> tags in a <ul> on serverside using PHP_问答_开发者

Count number of <li> tags in a <ul> on serverside using PHP

开发者 https://www.devze.com 2022-12-25 10:23 出处：网络

I have a < ul > with some < li >(s). I want to count the number of these <开发者_JAVA技巧; li>s on server side. And if this number qualifies a given condition then i would like to add some mor

相关专题：php

I have a < ul > with some < li >(s). I want to count the number of these <开发者_JAVA技巧; li>s on server side. And if this number qualifies a given condition then i would like to add some more < li> elements to this < ul>. Can someone please help me with this ?

First a simple example using php's DOM module and XPath

$s = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html><head><title>...</title></head><body>
  <ul>
    <li>1</li><li>2</li>
  </ul>
  <ul>
    <li>1</li><li>2</li><li>3</li>
  </ul>
  <ul>
    <li>x</li><li>y</li>
  </ul>
</body></html>';

$doc = new DOMDocument;
$doc->loadhtml($s);
$xpath = new DOMXPath($doc);

foreach( $xpath->query('//ul[ count(li)<3 ]') as $ul ) {
  $li = $doc->createElement('li', 'abc...xyz');
  $ul->appendChild($li);
}

echo $doc->savehtml();

and then an oversimplified example of what I meant by "And that function can't include the extra data as well?"

echo firstFunction(array('a'), 'secondFunction');

function firstFunction($arrData, $fnFill=null) {
  $rv = '';
  $counter = 0;
  foreach($arrData as $e) {
    $counter += 1;
    $rv .= '<li>'.htmlspecialchars($e).'</li>';
  }

  if ( 4 > $counter && !is_null($fnFill)) {
    // oh no. Not enough elements. Let's call $fnFill(), it provides some filler material
    $rv .= $fnFill();
  }
  return $rv;
}

// providing extra li elements
function secondFunction() {
  return '<li>x</li><li>y</li><li>z</li>';
}

Use PHP's DOM library, or look up Simple DOM Parser. They both have everything you need for manipulating and searching HTML to the extent of your question