PHP - Ajax XML Parser

Using with Ajax we can parser xml from local directory as well as servers, Below example demonstrate how to parser xml with web browser.
<html>
   <head>
   
      <script>
         function showCD(str) {
            if (str == "") {
               document.getElementById("txtHint").innerHTML = "";
               return;
            }
            
            if (window.XMLHttpRequest) {
               // code for IE7+, Firefox, Chrome, Opera, Safari
               xmlhttp = new XMLHttpRequest();
            }else {  
               // code for IE6, IE5
               xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            }
            
            xmlhttp.onreadystatechange = function() {
               if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                  document.getElementById("txtHint").innerHTML = xmlhttp.responseText;
               }
            }
            xmlhttp.open("GET","getcourse.php?q="+str,true);
            xmlhttp.send();
         }
      </script>
   
   </head>
   <body>
      
      <form>
         Select a Course:
         <select name = "cds" onchange = "showCD(this.value)">
            <option value = "">Select a course:</option>
            <option value = "Android">Android </option>
            <option value = "Html">HTML</option>
            <option value = "Java">Java</option>
            <option value = "Microsoft">MS technologies</option>
         </select>
      </form>
      
      <div id = "txtHint"><b>Course info will be listed here...</b></div>
      
   </body>
</html>
The above example will call getcourse.php using with GET method. getcourse.php file loads catalog.xml. getcourse.php is as shown below −
<?php
   $q = $_GET["q"];
   
   $xmlDoc = new DOMDocument();
   $xmlDoc->load("catalog.xml");
   
   $x = $xmlDoc->getElementsByTagName('COURSE');
   
   for ($i = 0; $i<=$x->length-1; $i++) {
      =
      if ($x->item($i)->nodeType == 1) {
         if ($x->item($i)->childNodes->item(0)->nodeValue == $q) {
            $y = ($x->item($i)->parentNode);
         }
      }
   }
	
   $cd = ($y->childNodes);
   
   for ($i = 0;$i<$cd->length;$i++) {
      if ($cd->item($i)->nodeType == 1) {
         echo("<b>" . $cd->item($i)->nodeName . ":</b> ");
         echo($cd->item($i)->childNodes->item(0)->nodeValue);
         echo("<br>");
      }
   }
?>
XML file having list of courses and details.This file is accessed by getcourse.php
<CATALOG>
   <SUBJECT>
      <COURSE>Android</COURSE>
      <COUNTRY>India</COUNTRY>
      <COMPANY>TutorialsPoint</COMPANY>
      <PRICE>$10</PRICE>
      <YEAR>2015</YEAR>
   </SUBJECT>
   
   <SUBJECT>
      <COURSE>Html</COURSE>
      <COUNTRY>India</COUNTRY>
      <COMPANY>TutorialsPoint</COMPANY>
      <PRICE>$15</PRICE>
      <YEAR>2015</YEAR>
   </SUBJECT>
   
   <SUBJECT>
      <COURSE>Java</COURSE>
      <COUNTRY>India</COUNTRY>
      <COMPANY>TutorialsPoint</COMPANY>
      <PRICE>$20</PRICE>
      <YEAR>2015</YEAR>
   </SUBJECT>
   
   <SUBJECT>
      <COURSE>Microsoft</COURSE>
      <COUNTRY>India</COUNTRY>
      <COMPANY>TutorialsPoint</COMPANY>
      <PRICE>$25</PRICE>
      <YEAR>2015</YEAR>
   </SUBJECT>
</CATALOG>
It will produce the following result −

    45 Lectures 
     9 hours 

 Malhar Lathkar

    34 Lectures 
     4 hours 

 Syed Raza

    84 Lectures 
     5.5 hours 

 Frahaan Hussain

    17 Lectures 
     1 hours 

 Nivedita Jain

    100 Lectures 
     34 hours 

 Azaz Patel

    43 Lectures 
     5.5 hours 

 Vijay Kumar Parvatha Reddy
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