Php + xml message board example tutorial 2-PHP source code

Ec (2); this is an xml parsing Class & lt ;? PhpclassMessage_XMLextendsDOMDocument {& nbsp; constfile_name & quot; e: myphpxmldomxmlmessage. xml & quot; & nbsp; private $ root; root node & nbsp; private $ PageNo; current page & nb script ec (2); script

This is an xml parsing class

Class Message_XML extends DOMDocument
{
Const file_name = "e:/myphp/xmldom/xml/message. xml ";
Private $ root; // root Node
Private $ PageNo; // current page
Private $ allNum; // The total number of records.
Private $ PageSize; // page size
Private $ allPages; // the total number of pages.
Public function _ construct ()
{
Parent: :__ construct ();
If (! File_exists (self: file_name ))
{
$ XmlStr =" ";
$ This-> loadXML ($ xmlStr );
$ This-> save (self: file_name );
} Else {
$ This-> load (self: file_name );
}
$ This-> root = $ this-> documentElement;
$ This-> get_pagemsg ();
}
// Obtain the page information
Private function get_pagemsg ()
{
$ This-> PageSize = 3; // page size
$ AllNode = $ this-> getElementsByTagName ("record ");
$ This-> allNum = $ allNode-> length; // The total number of records.
$ This-> allPages = ceil ($ this-> allNum/$ this-> PageSize); // total number of pages
$ This-> PageNo =$ _ GET ["PageNo"];
If ($ this-> PageNo <1 |! Is_numeric ($ this-> PageNo ))
{
$ This-> PageNo = 1;
} Else if ($ this-> PageNo> $ this-> allPages ){
$ This-> PageNo = $ this-> allPages;
}
$ This-> PageNo = (int) $ this-> PageNo;
}
// Display the message
Public function show_message ()
{
$ Start_num = ($ this-> PageNo-1) * $ this-> PageSize; // record start count
$ End_num = $ start_num + $ this-> PageSize-1; // record end count
$ AllNode = $ this-> getElementsByTagName ("record ");
$ I = 0;
Foreach ($ allNode as $ v)
{
If ($ I >=$ start_num & $ I <= $ end_num)
{
$ Autoid = $ v-> getElementsByTagName ("autoid")-> item (0)-> nodeValue;
$ Subject = $ v-> getElementsByTagName ("subject")-> item (0)-> nodeValue;
$ Content = $ v-> getElementsByTagName ("content")-> item (0)-> nodeValue;
$ Str ="

Message Title: $ subject

Message content:

$ Content

";
$ Str. ="

Edit and delete

";
Print $ str;
}
$ I ++;
}
$ This-> get_pageCode ();
}
// Obtain the current page number
Public function get_pageCode ()
{
$ Str ="

Current page :". $ this-> PageNo. "/". $ this-> allPages. "homepage PageNo-1 ). "'> Previous Page PageNo + 1 ). "'> next page allPages ). "'> last page ";
$ Str. ="";
Print $ str;
}
// Add a message page
Public function post_message ()
{
Print"

";
}
// Add a message
Public function add_message ($ Subject, $ Content)
{
$ Autoid = microtime (); // Message ID
$ Autoid = substr (strrchr (str_replace ("", "", $ autoid), "."), 1 );
$ Node_top = $ this-> root-> appendChild ($ this-> createElement ("record "));
$ Node_top-> appendChild ($ this-> createElement ("autoid", $ autoid ));
$ Node_top-> appendChild ($ this-> createElement ("subject", $ Subject ));
$ Node_top-> appendChild ($ this-> createElement ("content", $ Content ));
$ This-> save (self: file_name );
Echo "script" alert ('message added successfully! '); Window. location =' ". $ _ SERVER ['php _ SELF ']."? PageNo = ". $ _ GET ['pageno']." 'script ";
}
// Clear the message
Public function clear_message ()
{
$ Fp = @ fopen (self: file_name, "w + ");
If ($ fp)
{
$ Str =" ";
Fwrite ($ fp, $ str );
Fclose ($ fp );
Echo "script" alert ('cleared successfully! '); Window. location =' ". $ _ SERVER ['php _ SELF ']."' script ";
} Else {
Echo "script alert ('failed to empty! '); History. back (); script ";
}
}
// Set the Node path and operation object ID
Private function set_nodePath ($ AutoID)
{
$ Xpath = new DOMXPath ($ this );
$ Node_top = $ xpath-> query ("// record [autoid = $ AutoID]");
Return $ node_top;
}
// Delete the message
Public function delete_message ($ AutoID)
{
$ Node_top = $ this-> set_nodePath ($ AutoID );
$ This-> root-> removeChild ($ node_top-> item (0 ));
$ This-> save (self: file_name );
Echo "script" alert ('deleted successfully! '); Location =' ". $ _ SERVER ['php _ SELF ']."? PageNo = ". $ _ GET ['pageno']." 'script ";
}
// Edit the message page
Public function edit_message ($ AutoID)
{
$ Node_top = $ this-> set_nodePath ($ AutoID );
// Method 1
// $ Subject = $ node_top-> item (0)-> getElementsByTagName ("subject")-> item (0)-> nodeValue;
// $ Content = $ node_top-> item (0)-> getElementsByTagName ('content')-> item (0)-> nodeValue;
// Method 2
Foreach ($ node_top-> item (0)-> childNodes as $ v)
{
$ Value [] = $ v-> textContent; // Note: $ value must be written as an array like this; otherwise, an error occurs.
}
Print"

";
}
// Edit the message
Public function save_message ($ AutoID, $ Subject, $ Content)
{
$ Node_top = $ this-> set_nodePath ($ AutoID );
$ Replace_info [0] = $ AutoID;
$ Replace_info [1] = $ Subject;
$ Replace_info [2] = $ Content;
$ I = 0;
Foreach ($ node_top-> item (0)-> childNodes as $ v)
{
$ New_content = $ this-> createTextNode ($ replace_info [$ I]);
$ V-> replaceChild ($ new_content, $ v-> lastChild );
$ I ++;
}
$ This-> save (self: file_name );
Echo "script" alert ('edited successfully! '); Location =' ". $ _ SERVER ['php _ SELF ']."? PageNo = ". $ _ GET ['pageno']." 'script ";
}
}
?>