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By :Mark Wilson
I am the creator of TopXML. I am available for international and local (Australia) contracts. I am a Solution Architect/Business Analyst. I have worked in IT in several countries (NZ, Australia, South Africa, UK) building and training teams for government and very large non-governmental organizations. I am ex-Microsoft Consulting Services. I wrote the first book on Microsoft XML published in 2000 called XML Programming with VB and ASP. Most recently I have been building tools for the SEO industry. Ask me for a 37 point SEO health-checkup for your website.
First posted :03/24/2008
Times viewed :273
 

DOMAttr Function isId

PHP Version: (No version information might be only in CVS. I have used this function in PHP5)

Description

This function checks if the attribute is a defined ID and returns success if it is ID. According to the DOM standard this requires a DTD which defines the attribute ID to be of type ID. You need to validate your document with

Using DOMDocument->validate() function or DOMDocument::validateOnParse before using this function.

Usage:

bool DOMAttr->isId ( void )

This function will check whether the attribute is ID. If attribute of type ID then it returns TRUE otherwise returns FALSE.

Example:

The DTD which I have written with ID as attribute is:

     <?xml version="1.0" encoding="UTF-8"?>

<!ELEMENT SSN (#PCDATA)>

<!ELEMENT company (#PCDATA)>

<!ELEMENT employee (employeename, employeeaddress, SSN, company)>

<!ATTLIST employee

     id ID #REQUIRED <!--the id attribute is of type ID-->

>

<!ELEMENT employeeaddress (#PCDATA)>

<!ELEMENT employeename (#PCDATA)>

The XML file is:

     <?xml version="1.0"?>

<!DOCTYPE employee SYSTEM "C:/topxml_demo/php/xml_files/employee.dtd">

<employee id="Id111">

     <employeename>test</employeename>

     <employeeaddress>test123</employeeaddress>

     <SSN>12343456</SSN>

     <company>TOPXML</company>

</employee>

PHP code file content:

     <html>

          <head>

               <title>Usage of DOMAttr->isId</title>

 </head>

          <body>

          <?php

               //I created a new DOMDocument

               $doc = new DomDocument;

               // We need to validate our document before refering to the id

               $doc->validateOnParse = true;

               //Load the save.xml file into DOMDocument

               $doc->Load('C:/topxml_demo/php/xml_files/save.xml');

               // We retrieve the attribute named id of the employee element

$attr = $doc->getElementsByTagName('employee')->item(0)->getAttributeNode('id');

               //printed by using isId() function to check whether “id” is of type ID or not

              

               var_dump($attr->isId()); // bool(true)

          ?>

          </body>

</html>

Output:

bool(true)

It returned true because the id attribute is of type ID.

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