PHP - DOM Parser Example

The DOM extension in PHP comes with extensive functionality with which we can perform various operations on XML and HTML documents. We can dynamically construct a DOM object, load a DOM document from a HTML file or a string with HTML tag tree. We can also save the DOM document to a XML file, or extract the DOM tree from a XML document.

The DOMDocument class is one the most important classes defined in the DOM extension.

PHP CODE

$obj = new DOMDocument($version = "1.0", $encoding = "")

It represents an entire HTML or XML document; serves as the root of the document tree. The DOMDocument class includes definitions of a number of static methods, some of which are introduced here −

Sr.NoMethods & Description1createElementCreate new element node2createAttributeCreate new attribute3createTextNodeCreate new text node4getElementByIdSearches for an element with a certain id5getElementsByTagNameSearches for all elements with given local tag name6loadLoad XML from a file7loadHTMLLoad HTML from a string8loadHTMLFileLoad HTML from a file9loadXMLLoad XML from a string10saveDumps the internal XML tree back into a file11saveHTMLDumps the internal document into a string using HTML formatting12saveHTMLFileDumps the internal document into a file using HTML formatting13saveXMLDumps the internal XML tree back into a string

Example

Let us use the following HTML file for this example −

try-it-yourself — CodesCompiler

Preview

We shall now extract the Document Object Model from the above HTML file by calling the loadHTMLFile() method in the following PHP code −

PHP CODE

&lt;?php 

   /*** a new dom object ***/ 
   $dom = new domDocument; 

   /*** load the html into the object ***/ 
   $dom-&gt;loadHTMLFile("hello.html");

   /*** discard white space ***/ 
   $dom-&gt;preserveWhiteSpace = false; 

   /*** the table by its tag name ***/ 
   $tables = $dom-&gt;getElementsByTagName('table'); 

   /*** get all rows from the table ***/ 
   $rows = $tables[0]-&gt;getElementsByTagName('tr'); 

   /*** loop over the table rows ***/ 
   foreach ($rows as $row) {
   
      /*** get each column by tag name ***/ 
      $cols = $row-&gt;getElementsByTagName('td'); 

      /*** echo the values ***/ 
      echo 'Designation: '.$cols-&gt;item(0)-&gt;nodeValue.'<br />'; 
      echo 'Manager: '.$cols-&gt;item(1)-&gt;nodeValue.'<br />'; 
      echo 'Team: '.$cols-&gt;item(2)-&gt;nodeValue; 
      echo '<hr />'; 
   }
   
?&gt;

It will produce the followingoutput−

PHP CODE

Designation: Android
Manager: Gopal
Team: Sairam
________________________________________
Designation: Hadoop
Manager: Gopal
Team: Satish
________________________________________
Designation: HTML
Manager: Gopal
Team: Raju
________________________________________
Designation: Web technologies
Manager: Gopal
Team: Javed
________________________________________
Designation: Graphic
Manager: Gopal
Team: Satish
________________________________________
Designation: Writer
Manager: Kiran
Team: Amith
________________________________________
Designation: Writer
Manager: Kiran
Team: Vineeth
________________________________________

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