search
HomeBackend DevelopmentPHP TutorialA very handy XML class! ! Original_PHP Tutorial



// I am not familiar with XML, and the description of XML may be wrong in the annotation
// This is just an idea. To be implemented, it should be slightly modified. Some data that are not commonly queried using XML can be used. Save
// For example, user information in a virtual community will generally be displayed only if the user himself or another user specifies his USERNAME
// The rest requires opening, querying, interpreting data sets, and closing the database every time consumption.

define("enter",chr(13).chr(10));
class DATA_XML //Key! ! ! A custom class
{
var $parser; //XML interpreter
var $tags; //XML tags
var $on; //
var $root; // root Element
var $Data = array(); // Element array

function DATA_XML($filename,$root) //Class initial function filename file name, root root element
{
$this->root = $root; //Initial root element
$this->parser = xml_parser_create();//Create interpretation object
xml_set_object(&$this->parser,&$this );//Set object
xml_set_element_handler($this->parser,"tag_on","tag_off");//Set element management function
xml_set_character_data_handler($this->parser,"getdata"); //Set data management events
xml_parser_set_option($this->parser, XML_OPTION_CASE_FOLDING, 0); //Requires strict case sensitivity

if( file_exists($filename) ) //File found?
{//Find
$fp = fopen($filename,"r"); //Open for read only
$c = fread($fp,filesize($filename)); //Read data
fclose($fp);//Close
$this->parse($c); //Set the interpretation object
}
else
{
echo "ooooo "; //! ? ! It seems to be used for debugging, just remove the else
}


}

function parse($data)//Explanation function
{
xml_parse ($this->parser,$data);
}

function tag_on($parser,$tag,$attributes)//Discover element trigger function
{
$this- >on = true; // Already triggered
$this->tags = $tag;
//echo $tag;
}

function tag_off($parser,$ tag) //Element binding function
{
$this->on = false; // Element binding
}

function getdata($parser,$cdata) // Take out the element
{
if($this->on && $this->tags!=$this->root)
{//It is better to verify, (whether it is an element now starting, and not the root element? )

$this->Data[$this->tags]=trim($cdata);
                                                ! Use tags to make an array table and add data to the array elements
//echo trim($cdata);
//echo $this->tags;
//echo "n";
}
}
function check($str)
{//Check character
if( strlen($str)return ' ' ;//Return ' '
else
return $str;//Otherwise return to the original path (otherwise the XML will not seem to have an end tag)
}
function saveas($filename)//Save as For
{
$c=''.enter; ",chr(13).chr(10));
$c.="root.">".enter;
for( reset($this->Data);$i=key($this->Data);next($this->Data))
{//Start to list all the data
$c.= "".$this->check($this->Data[$i])."".$i."> ;".enter;
// Use the array table name as the element label and add the data content
}
//echo $c;
$c.="".$ this->root.">".enter;//End tag
$fp = fopen( $filename , "w" );//Write file
fwrite($fp,$c);
fclose($fp);

}
};




/*New key an XML file
                                                      DATA_XML(path."arm.xml","DATA"/*root element*/);
$xml->Data["UserName"]="Guan Yu";
    $xml->Data[ "Nick"]="Guan Yunchang";
$xml->saveas(path."arm.xml");
unset( $xml );
// Read a file
$ xml = new DATA_XML(path."arm.xml","DATA");
                      echo $xml->Data["Nick"];//Show it?
$xml->Data["Nick"]="Master Guan";//UPDATE
$xml->Data["Master"]="Liu Bei";//INSERT INTO
$ xml->saveas(path."arm.xml");//Save as overwrite itself
*/
?>

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/313924.htmlTechArticle? // I am not familiar with XML. The description of XML may be wrong. // This is just an idea. If implemented, it should be slightly modified, and some data queried by uncommon conditions can be saved in XML //...
Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Explain the concept of a PHP session in simple terms.Explain the concept of a PHP session in simple terms.Apr 26, 2025 am 12:09 AM

PHPsessionstrackuserdataacrossmultiplepagerequestsusingauniqueIDstoredinacookie.Here'showtomanagethemeffectively:1)Startasessionwithsession_start()andstoredatain$_SESSION.2)RegeneratethesessionIDafterloginwithsession_regenerate_id(true)topreventsessi

How do you loop through all the values stored in a PHP session?How do you loop through all the values stored in a PHP session?Apr 26, 2025 am 12:06 AM

In PHP, iterating through session data can be achieved through the following steps: 1. Start the session using session_start(). 2. Iterate through foreach loop through all key-value pairs in the $_SESSION array. 3. When processing complex data structures, use is_array() or is_object() functions and use print_r() to output detailed information. 4. When optimizing traversal, paging can be used to avoid processing large amounts of data at one time. This will help you manage and use PHP session data more efficiently in your actual project.

Explain how to use sessions for user authentication.Explain how to use sessions for user authentication.Apr 26, 2025 am 12:04 AM

The session realizes user authentication through the server-side state management mechanism. 1) Session creation and generation of unique IDs, 2) IDs are passed through cookies, 3) Server stores and accesses session data through IDs, 4) User authentication and status management are realized, improving application security and user experience.

Give an example of how to store a user's name in a PHP session.Give an example of how to store a user's name in a PHP session.Apr 26, 2025 am 12:03 AM

Tostoreauser'snameinaPHPsession,startthesessionwithsession_start(),thenassignthenameto$_SESSION['username'].1)Usesession_start()toinitializethesession.2)Assigntheuser'snameto$_SESSION['username'].Thisallowsyoutoaccessthenameacrossmultiplepages,enhanc

What are some common problems that can cause PHP sessions to fail?What are some common problems that can cause PHP sessions to fail?Apr 25, 2025 am 12:16 AM

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

How do you debug session-related issues in PHP?How do you debug session-related issues in PHP?Apr 25, 2025 am 12:12 AM

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

What happens if session_start() is called multiple times?What happens if session_start() is called multiple times?Apr 25, 2025 am 12:06 AM

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

How do you configure the session lifetime in PHP?How do you configure the session lifetime in PHP?Apr 25, 2025 am 12:05 AM

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

MinGW - Minimalist GNU for Windows

MinGW - Minimalist GNU for Windows

This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools