Php+xml Message Board Example tutorial Two

This is an XML parsing class

<?php
Class Message_xml extends DOMDocument
{
Const FILE_NAME = "E:/myphp/xmldom/xml/message.xml";
Private $root; Root node
Private $PageNo; Current page
Private $allNum; Total Records
Private $PageSize; Page size
Private $allPages; Total pages
Public Function __construct ()
{
Parent::__construct ();
if (!file_exists (self::file_name))
{
$XMLSTR = "<?xml version= ' 1.0 ' encoding= ' utf-8 '" ><root/> ";
$this-> Loadxml ($XMLSTR);
$this-> Save (Self::file_name);
}else{
$this-> Load (self::file_name);
}
$this-> root = $this-> documentelement;
$this-> get_pagemsg ();
}
Get page Info
Private Function Get_pagemsg ()
{
$this-> PageSize = 3; Page size
$allNode = $this-> getelementsbytagname ("Record");
$this-> allnum = $allNode-> length; Total Records
$this-> allpages = ceil ($this-> allnum/-> $this PageSize); Total 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;
}
Show message
Public Function Show_message ()
{
$start _num = ($this-> PageNo-1) * $this-> PageSize; Number of records started
$end _num = $start _num + $this-> PageSize-1; Number of records ended
$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 = "<div class= ' msginfo ' ><p class= ' MSgt ' ><span> message title:</span> $subject </p><p class= ' MSGC ' ><span> message content: </span><br/><br/>&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; $content </p> ";
$str. = "<p class= ' msgcmd ' ><a href= '"? action=edit_message&autoid= $autoid &pageno=$_get[pageno] ' > Edit </a> <a href= '? action=delete_message&autoid= $autoid &pageno=$_get[pageno] ' > Delete </a></p></div> ';
Print $str;
}
$i + +;
}
$this-> Get_pagecode ();
}
Get current page number
Public Function Get_pagecode ()
{
$str = "<div class= ' pagecode ' > Current page:". $this-> PageNo. "/" $this-> allpages. " &nbsp;&nbsp;&nbsp;<a href= '? Pageno=1 ' > Home </a>&nbsp;<a href= '? Pageno= ". ($this->pageno-1). "' > previous page </a>&nbsp;<a href= '? Pageno= ". ($this->pageno + 1). "' > next page </a>&nbsp;<a href= '? Pageno= ". ($this->allpages). "' > Last </a> ";
$str. = "&nbsp;&nbsp;&nbsp;<input type= ' text ' size= ' 2 ' id= ' gopage ' value= '". $this->pageno. "' ><input type= ' button ' value= ' Go ' onclick=window.location= '? Pageno= ' +document.getelementbyid (' gopage ') .value> ";
Print $str;
}
Add a Message page
Public Function Post_message ()
{
Print "<div><form method= ' post ' action= '? Action=add_message&pageno=$_get[pageno] ' > ';
Print "<p> title: <input type= ' text ' name= ' Subject ' size= '/></p> ';
Print "<p> contents: <textarea name= ' content ' cols= ' rows= ' 5 ' ></textarea></p>";
Print "<p><input type= ' submit ' value= ' Add message ' ></p></div></form>";
}
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 (' Add message success! '); window.location= '. $_server[' php_self '. "? pageno= ". $_get[' PageNo ']." ' </script> ";
}
Clear message
Public Function Clear_message ()
{
$fp = @ fopen (self::file_name, "w+");
if ($FP)
{
$str = "<?xml version= ' 1.0 ' encoding= ' utf-8 '" ><root/> ";
Fwrite ($fp, $STR);
Fclose ($FP);
echo "<script>alert" (' Empty success! '); window.location= '. $_server[' php_self '. "' </script> ";
}else{
echo "<script>alert" (' Empty failed! '); History.back ();</script> ";
}
}
Set node path and action object ID
Private Function Set_nodepath ($AutoID)
{
$xpath = new Domxpath ($this);
$node _top = $xpath-> query ("//record[autoid= $AutoID]");
return $node _top;
}
Delete message
Public Function Delete_message ($AutoID)
{
$node _top = $this-> set_nodepath ($AutoID);
$this-> root-> removechild ($node _top-> item (0));
$this-> Save (Self::file_name);
echo "<script>alert" (' Delete succeeded! '); location= '. $_server[' php_self '. "? pageno= ". $_get[' PageNo ']." ' </script> ";
}
Edit Message Page
Public Function Edit_message ($AutoID)
{
$node _top = $this-> set_nodepath ($AutoID);
Value Method 1
$subject = $node _top-> Item (0)-> getElementsByTagName ("subject")-> item (0)-> nodevalue;
$content = $node _top-> Item (0)-> getElementsByTagName (' content ')-> item (0)->nodevalue;
Value Method 2
foreach ($node _top-> Item (0)-> childnodes as $v)
{
$value [] = $v-> textcontent; Note: The $value here must be written in an array, otherwise there will be an error
}
Print "<div><form method= ' post ' action= '? action=save_message&autoid= $AutoID &pageno=$_get[pageno] ' > ';
Print "<p> title: <input type= ' text ' name= ' Subject ' value= $value [1] size= '/></p> ';
Print "<p> contents: <textarea name= ' content ' cols= ' rows= ' 5 ' > $value [2]</textarea></p>";
Print "<p><input type= ' submit ' value= ' editorial message ' ></p></div></form>";
}
Edit Message
Public Function Save_message ($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" (' Edit succeeded! '); location= '. $_server[' php_self '. "? pageno= ". $_get[' PageNo ']." ' </script> ";
}
}
?>