上一次我们研究了guest.php文件.具体的问题还要求读者朋友自己深入的去实践,而且需要一些工具书来学习,如果您一点php的知识都没有,笔者奉劝您就不要想下看了,笔者没有太多的时间和篇幅去逐句探究一个php文件的用途和意义.好的,接下来我们来作edit.php这个文件.
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//edit.php
<?
if ($submit)
{
if ($savepassword=="on")
{setcookie("txtpassword","$txtpassword",time()+30*24*3600);}
else
{setcookie("txtpassword");}
}
?>
<html>
<style type=text/css>
td {font-size: 10pt;}
textarea
{
font-family: "宋体";
font-size: 10pt;
}
</style>
<head>
<meta http-equiv="content-language" content="zh-cn">
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<title>修改留言</title>
<?
require("sys.php");
function readvalue($tags,$tage)
{
global $message,$long,$reply;
$strstart=strlen(strstr($message,$tags))-strlen($tags);//去除标记后变量所在字串的起始位置.
$strend=strlen(strstr($message,$tage));
$len=$strstart-$strend;
$strstart=$long-$strstart;//起始字符.
$strstring=substr($message,$strstart,$len);
return $strstring;
}
function save($record)
{
global $txtcontent,$txtemail,$txthomepage,$txtemail,$txtname,$txtfrom,$txtreply,$remote_addr,$guestfile;
$content=file($guestfile,"r");
$space = " ";
$time = date(y年m月d日h小时i分);
$ip=$remote_addr;
$txtreply=stripslashes($txtreply);
$txtcontent=stripslashes($txtcontent);
$txtcontent=htmlspecialchars($txtcontent);
$txtcontent=check_strlen_long($txtcontent);
$txtcontent=nl2br($txtcontent);
$wcontent = "<tr><td><font color=#ab00e1>留言内容:</font><br><!--content>$txtcontent<!--endcontent> ";
$wcontent=$wcontent."<br><font color=#6633ff>留言人大名:</font><!--name>$txtname<!--endname> ";
if ($txtemail !="")
{$wcontent=$wcontent."<br><font color=#9900cc>电子信箱</font><a href="mailto:$txtemail"><!--email>$txtemail<!--endemail></a>"."$space";}
if ($txthomepage !="http://")
{$wcontent=$wcontent."<font color=#9900cc>主页:</font>$txthompage<a href="$txthomepage" target=new><!--homepage>$txthomepage<!--endhomepage></a>";}
$wcontent=$wcontent."<br><font color=#0000ff>时间:$time 来自:<!--from>$txtfrom<!--endfrom> ".$ip."</font>";
$wcontent=ereg_replace(chr(10),"",$wcontent);
$wcontent=$wcontent."<hr size=1></td></tr>";
$txtreply=ereg_replace(chr(10),"",$txtreply);
$wcontent=$wcontent.$txtreply."n";
$count=count($content);
$fp=fopen($guestfile,"w");
for ($i=0;$i<$count;$i++)
{
if ($i==$record-1)
{$content[$i]=$wcontent;}
fputs($fp,$content[$i]);
}
fclose($fp);
}
$content=file($guestfile,"r");
$message=$content[$record-1];
$long=strlen($message);
$txtcontent=readvalue('<!--content>','<!--endcontent>');
$txtname=readvalue('<!--name>','<!--endname>');
$txtfrom=readvalue('<!--from>','<!--endfrom>');
$txtemail=readvalue('<!--email>','<!--endemail>');
$txthomepage=readvalue('<!--homepage>','<!--endhomepage>');
$txtcontent=strip_tags($txtcontent);
$tags="<!--reply>";
$txtreply=strstr($message,$tags);
$txtreply=ereg_replace(""",""",$txtreply);
if ($submit)
{
if ($txtpassword==$managepwd)
{
if ($txtname!="" and $txtcontent!="")
{
save($record);
echo "<meta http-equiv=refresh content="1;url=guest.php">";
exit;
}else {$errorm="留言人姓名和内容必填!!";}
}
else {$errorm="密码错误,只有管理员有权修改!!";}
}
?>
</head>
<body bgcolor="#ffffff" background="back.gif">
<? include('head.htm');?>
<div align="center">
<center>
<table border="1" width="68%" height="31" cellspacing="0" cellpadding="7" bordercolor="#e3e3e3">
<form action="edit.php" method=post>
<?
if ($errorm and $submit)
{
echo"<tr>";
echo"<td height=40 colspan=4>";
echo"<font color=red>出错了,</font>$errorm";
echo"</td>";
echo"</tr>";
}
?>
<tr>
<td width="18%" height="37" bgcolor="#f0f0f0"><font color="#000000">留言大名</font></td>
<td width="39%" height="37" bgcolor="#ffffff">
<input type="text" name="txtname" size="26" value=<?echo "$txtname"?>>
</td>
<td width="11%" height="37" bgcolor="#f0f0f0"><font color="#000000">来自</font></td>
<td width="32%" height="37" bgcolor="#ffffff">
<input type="text" name="txtfrom" size="20" value=<?echo "$txtfrom"?>>
</td>
</tr>
<tr>
<td width="18%" height="31" bgcolor="#f0f0f0"><font color="#000000">主页地址</font></td>
<td width="39%" height="31" bgcolor="#ffffff">
<input type="text" name="txthomepage" size="26" value=<?echo "$txthomepage"?>>
</td>
<td width="11%" height="31" bgcolor="#f0f0f0"><font color="#000000">email</font></td>
<td width="32%" height="31" bgcolor="#ffffff">
<input type="text" name="txtemail" size="20" value=<?echo "$txtemail"?>>
</td>
</tr>
<tr bgcolor="#ffffff">
<td height="31" colspan="4"><font color="#000000">留言内容</font></td>
</tr>
<tr bgcolor="#f0f0f0">
<td height="105" colspan="4" valign="middle" align="center">
<textarea rows="6" name="txtcontent" cols="50" wrap="virtual"><? echo "$txtcontent"?>
</textarea>
</td>
</tr>
<tr bgcolor="#ffffff">
<td height="40" colspan="4" valign="middle" align="center"> <font color="#000000">修改密码</font>
<input type="password" name="txtpassword" size="10" value=<?echo "$txtpassword"?>>
<font color="#000000">是否保存密码</font>
<input type="checkbox" name="savepassword" value="on" checked>
<input type=hidden name=record value=<? echo "$record"?>>
<input type="submit" value="我要修改了" name="submit">
</td>
</tr>
<? echo "$txtreply"?>
<input type=hidden name=txtreply value="<? echo "$txtreply" ?>">
</form>
</table>
</center>
</div>
<?include('bottom.htm');?>
</body>
</html>
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该注明的地方我已作了诠释.php可以嵌入html代码中,这样写起代码很惬意.
待续...
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