php 常用代码集
1、连接MYSQL数据库代码
<?php
$connec=mysql_connect("localhost","root","root") or die("不能连接数据库服务器： ".mysql_error());
mysql_select_db("liuyanben",$connec) or die ("不能选择数据库: ".mysql_error());
mysql_query("set names 'gbk'");
?>
2、读取数据库，并实现循环输出
<?php
$sql="select * from liuyan order by ly_id desc";
$conn=mysql_query($sql,$connec);
while($rs=mysql_fetch_array($conn)){
?>
<table width="476" border="1" cellspacing="0" cellpadding="0">
<tr>
<td width="135" height="30"><div align="center">留言主题</div></td>
<td width="204" height="30"><div align="center">留言时间</div></td>
<td width="129" height="30"><div align="center">留言人</div></td>
</tr>
<tr bgcolor="#CC9999">
<td height="30"><?= $rs["ly_title"]?>
<div align="center"></div></td>
<td height="30"><?= $rs["ly_time"]?>
<div align="center"></div></td>
<td height="30"><?= $rs["ly_author"]?>
<div align="center"></div></td>
</tr>
<tr>
<td height="30"><div align="center"><a href="huifu.php?id=<?php echo $rs["ly_id"]?>">回复留言</a></div></td>
<td height="30"><div align="center"><a href="viewhuifu.php?id=<?php echo $rs["ly_id"]?>">查看回复信息</a></div></td>
<td height="30"><div align="center">已有回复</div></td>
</tr>
</table>
<?php
}
?>
3、如何实现分页，包括两个函数，两个调用
1）两个函数
<?
//分页函数
function genpage(&$sql,$page_size=2)
{
global $prepage,$nextpage,$pages,$sums; //out param
$page = $_GET["page"];
$eachpage = $page_size;
$pagesql = strstr($sql," from ");
$pagesql = "select count(*) as ids ".$pagesql;
$conn = mysql_query($pagesql) or die(mysql_error());
if($rs = mysql_fetch_array($conn)) $sums = $rs[0];
$pages = ceil(($sums-0.5)/$eachpage)-1;
$pages = $pages>=0?$pages:0;
$prepage = ($page>0)?$page-1:0;
$nextpage = ($page<$pages)?$page+1:$pages;
$startpos = $page*$eachpage;
$sql .=" limit $startpos,$eachpage ";
}
//显示分页
function showpage()
{
global $page,$pages,$prepage,$nextpage,$queryString; //param from genpage function
$shownum =10/2;
$startpage = ($page>=$shownum)?$page-$shownum:0;
$endpage = ($page+$shownum<=$pages)?$page+$shownum:$pages;
echo "共".($pages+1)."页: ";
if($page>0)echo "<a href=$PHP_SELF?page=0$queryString>首页</a>";
if($startpage>0)
echo " ... <b><a href=$PHP_SELF?page=".($page-$shownum*2)."$queryString>«</a></b>";
for($i=$startpage;$i<=$endpage;$i++)
{
if($i==$page) echo " <b>[".($i+1)."]</b> ";
else echo " <a href=$PHP_SELF?page=$i$queryString>".($i+1)."</a> ";
}
if($endpage<$pages)
echo "<b><a href=$PHP_SELF?page=".($page+$shownum*2)."$queryString>»</a></b> ... ";
if($page<$pages)
echo "<a href=$PHP_SELF?page=$pages$queryString>尾页</a>";
}
//显示带分类的分页
function showpage1()
{
$fenlei=$_GET["fenleiid"];
global $page,$pages,$prepage,$nextpage,$queryString; //param from genpage function
$shownum =10/2;
$startpage = ($page>=$shownum)?$page-$shownum:0;
$endpage = ($page+$shownum<=$pages)?$page+$shownum:$pages;
echo "共".($pages+1)."页: ";
if($page>0)echo "<a href=$PHP_SELF?fenleiid=$fenlei&page=0$queryString>首页</a>";
if($startpage>0)
echo " ... <b><a href=$PHP_SELF?fenleiid=$fenlei&page=".($page-$shownum*2)."$queryString>«</a></b>";
for($i=$startpage;$i<=$endpage;$i++)
{
if($i==$page) echo " <b>[".($i+1)."]</b> ";
else echo " <a href=$PHP_SELF?fenleiid=$fenlei&page=$i$queryString>".($i+1)."</a> ";
}
if($endpage<$pages)
echo "<b><a href=$PHP_SELF?fenleiid=$fenlei&page=".($page+$shownum*2)."$queryString>»</a></b> ... ";
if($page<$pages)
echo "<a href=$PHP_SELF?fenleiid=$fenlei&page=$pages$queryString>尾页</a>";
}
?>
2）两个调用
第一个
<?php
$sql="select * from liuyan order by ly_id desc";
genpage($sql); //只需要正常代码加上这一行就ok。
$conn=mysql_query($sql,$connec);
while($rs=mysql_fetch_array($conn)){
?>
第二个
<?php
}
?>
<?php
showpage(); //显示页
?>
<?php
mysql_close();
?>
4、服务器端包含
<?php require_once('conn.php'); ?>
5、如何将一条记录写入数据库，然后提示并跳转页面
<?php
$ly_title=$_POST["ly_title"];
$ly_content=$_POST["ly_content"];
$ly_time=$_POST["ly_time"];
$ly_author=$_POST["ly_author"];
$ly_email=$_POST["ly_email"];
$sql="insert into liuyan(ly_title,ly_content,ly_time,ly_author,ly_email) values('".$ly_title."','".$ly_content."','".$ly_time."','".$ly_author."','".$ly_email."')";
mysql_query($sql,$connec);
echo("<script type='text/javascript'> alert('添加成功！');location.href='index.php';</script>");
?>
6、弹出对话框，并发生页面跳转
<?php
echo("<script type='text/javascript'> alert('添加成功！');location.href='index.php';</script>");
?>
7、信息查看页面（有条件读取数据库）
1)有条件读取数据库
<?php
$sql="select * from liuyan where ly_id=$_GET[id]";
$conn=mysql_query($sql,$connec);
$rs=mysql_fetch_array($conn);
?>
2）将某个字段输出
<?=$rs[ly_title]?>
3）关闭数据库
<?php
mysql_close();
?>
8、对数据库中某一条记录进行更新操作，并作提示跳转
<?php
$ly_title=$_POST["ly_title"];
$ly_content=$_POST["ly_content"];
$ly_time=$_POST["ly_time"];
$ly_author=$_POST["ly_author"];
$ly_email=$_POST["ly_email"];
$sql="update liuyan set ly_title='$ly_title',ly_content='$ly_content',ly_time='$ly_time',ly_author='$ly_author',ly_email='$ly_email' where ly_id=$_GET[id]";
mysql_query($sql,$connec);
echo("<script type='text/javascript'> alert('更新成功！');location.href='../index.php';</script>");
?>
9、如何删除数据库中的一条记录
<?php
$sql="delete from liuyan where ly_id=$_GET[id]";
mysql_query($sql,$connec);
echo("<script type='text/javascript'> alert('删除成功！');location.href='../index.php';</script>");
?>
10、如何进行会员登录验证
<?php
session_start();
$username=$_POST["username"];
$password=$_POST["password"];
$sql="select * from admin where username='".$username."' && password='".$password."'";
$result=mysql_query($sql,$connec);
if($row=mysql_fetch_array($result)){
session_register("admin");
$admin=$username;
echo("<script type='text/javascript'> alert('登录成功！');location.href='admin.php';</script>");}
else
{
echo("<script type='text/javascript'> alert('你输入的用户名或密码错误，请重新输入！');location.href='login.php';</script>");
}
mysql_close();
?>
11、如何对SESSION进行检验（后台检查页面的制作）
<?php
session_start();
if(!isset($_SESSION["admin"])){
header("location:login.php");
exit;
}
?>
12、验证用户名及密码是否填写（javascript）
<SCRIPT language=javascript>
<!--
function confirmlogin()
{
if (document.frmmain.username.value.length<4 || document.frmmain.username.value=="")
{
document.frmmain.username.focus();
document.frmmain.username.select;
window.alert("请输入你的用户名!");
return false;
}
if (document.frmmain.password.value.length<4)
{
document.frmmain.password.focus();
document.frmmain.password.select;
window.alert("请输入你的密码!");
return false;
}
return true;
}
//-->
</SCRIPT>
13、在PHP中调用编辑器的方法
1）将编辑器文件夹放置后台管理文件夹内。
2）利用以下语句进行引入操作。
<input name="content" type="hidden" value=''>
<IFRAME ID="eWebEditor1" src="eWebEditorPHP38/ewebeditor.htm?id=content&style=coolblue" frameborder="0" scrolling="no" width="550" height="350"></IFRAME>
注：eWebEditorPHP38编辑器文件夹的名称。
id=content中content为上面隐藏域的名称
14、循环输出（能够实现分列）
1）首先插入一行一列表格
<?php
$i=1;
?>
<table>
<tr>
<?php
while($rs=mysql_fetch_array($conn)){
?>
<td>
被循环的其它表格和输出
</td>
<?php
if ($i % 2==0) {
echo "</tr><tr>";
}
$i++;
}
?>
</tr>
</table>
15、给下拉列表框绑定数据(并且在修改时默认选中)
<select name="fenleiid">
<?php
$sql="select * from fenleibiao";
$conn=mysql_query($sql,$connec);
while($rs1=mysql_fetch_array($conn)){
?>
<option value="<?=$rs1["fenleiid"]?>"
<?
if ($rs["fenleiid"]==$rs1["fenleiid"]){
echo "selected" ;
}
?>>
<?=$rs1["flname"]?>
</option>
<?php>
}
?>
</select>
16、获取字符长度函数
strlen($c)>12
17、定义一个字符截取函数
用法：<?=substrgb($rs["title"],10)?>
function substrgb($in,$num){
$pos=0;
$out="";
while($c=substr($in,$pos,1)){
if($c=="\n") break;
if(ord($c)>128){
$out.=$c;
$pos++;
$c=substr($in,$pos,1);
$out.=$c;
}else{
$out.=$c;
}
$pos++;
if($pos>=$num) break;
}
if($out!=$in) $out = $out . "...";
return $out;
}
18、判断是否是数字
!is_numeric(qq)
19、PHP技术中获取当前日期
$ptime=date("y-m-d");
20、用户注册时所使用的PHP验证程序
if ($admin=="" or (strlen($admin)>16) or (strlen($admin)<2)) {
echo "<SCRIPT language=JavaScript>alert('请输入用户名(不能大于16小于2)');";
echo"this.location.href='vbscript:history.back()';</SCRIPT>";
}
if ($password=="" or strlen($password)>16 or strlen($password)<6) {
echo "<SCRIPT language=JavaScript>alert('密码长度为6-16个字符');";
echo"this.location.href='vbscript:history.back()';</SCRIPT>";
}
if ($password=="") {
echo "<SCRIPT language=JavaScript>alert('确认密码不能为空');";
echo"this.location.href='vbscript:history.back()';</SCRIPT>";
}else{
if ($password!=$password1) {
echo "<SCRIPT language=JavaScript>alert('密码和确认密码不一致');";
echo"this.location.href='vbscript:history.back()';</SCRIPT>";
}
}
if ($wt="") {
echo "<SCRIPT language=JavaScript>alert('密码问题不能为空');";
echo"this.location.href='vbscript:history.back()';</SCRIPT>";
}
if ($da="") {
echo "<SCRIPT language=JavaScript>alert('问题答案不能为空');";
echo"this.location.href='vbscript:history.back()';</SCRIPT>";
}
if ($qq!="") {
if (!is_numeric($qq)) {
echo "<SCRIPT language=JavaScript>alert('QQ号码必须是数字');";
echo"this.location.href='vbscript:history.back()';</SCRIPT>";
}
}
if ($youbian=="" or strlen($youbian)!=6) {
echo "<SCRIPT language=JavaScript>alert('请正确输入邮编');";
echo"this.location.href='vbscript:history.back()';</SCRIPT>";
}
if ($youbian!="") {
if (!is_numeric($youbian)) {
echo "<SCRIPT language=JavaScript>alert('邮编必须是数字');";
echo"this.location.href='vbscript:history.back()';</SCRIPT>";
}
}
if ($dizhi="") {
echo "<SCRIPT language=JavaScript>alert('住址不能为空');";
echo"this.location.href='vbscript:history.back()';</SCRIPT>";
}
if ($mail=="") {
echo "<SCRIPT language=JavaScript>alert('E-mail不能为空！');";
echo "this.location.href='vbscript:history.back()';</SCRIPT>";
}
if ($textarea=="") {
echo "<SCRIPT language=JavaScript>alert('个人说明不能为空！');";
echo "this.location.href='vbscript:history.back()';</SCRIPT>";
}
if ($textarea=="" or strlen(textarea)>150) {
echo "<SCRIPT language=JavaScript>alert('个人说明为150个字符');";
echo"this.location.href='vbscript:history.back()';</SCRIPT>";
}
21、在线调查前台页面参考
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td background="images/bj_r1_c1.jpg">
<?php
$sql1="select * from voteclass where active=1";
$conn1=mysql_query($sql1,$connec);
$rs1=mysql_fetch_array($conn1);
?>
<form name="form3" method="post" action="vote_save.php">
<table width="80%" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td><div align="center"><?=$rs1[voteclass]?></div></td>
</tr>
<?php
$sql2="select * from votexiang where vc_id=".$rs1[vc_id];
$conn2=mysql_query($sql2,$connec);
?>
<tr>
<td>
<?php
if ($rs1["class"]==="单选"){
while($rs2=mysql_fetch_array($conn2)){ ?>
<input name="vote" type="radio" value="<?=$rs2[votexiang]?>">
<?=$rs2[votexiang]?>
<br>
<?php
}
}else{
?>
<?php
$i=1;
while($rs2=mysql_fetch_array($conn2)){
?>
<input name="vote<?=$i?>" type="checkbox" value="<?=$rs2[votexiang]?>">
<?=$rs2[votexiang]?>
<input name="shu" type="hidden" value="<?=$i?>">
<br>
<?php
$i++;
}
}
$id=$rs1["vc_id"]
?>
</td>
</tr>
<tr>
<td><input name="imageField2" type="image" src="images/votetj.jpg" width="59" height="22" border="0">
<a href="voteview.php?id=<?=$id?>" target="_blank">查看结果</a></td>
</tr>
</table>
</form>
</td>
</tr>
</table>
22、在线调查处理页面参考代码
<?php
$shu=$_POST["shu"];
$vote=$_POST["vote"];
if ($shu!=""){
for ($i=1;$i<=$shu;$i++){
$votexiang.=$_POST["vote$i"];
}
if ($votexiang!=""){
for ($i=1;$i<=$shu;$i++){
if ($_POST["vote$i"]!=""){
$sql="update votexiang set voteshu=voteshu+1 where votexiang='".$_POST["vote$i"]."'";
mysql_query($sql,$connec);
echo("<script type='text/javascript'> alert('添加成功！');location.href='index.php';</script>");
}
}
}else{
echo("<script type='text/javascript'> alert('没有进行投票项目选择！');location.href='index.php';</script>");
}
}
if ($vote!="") {
$sql="update votexiang set voteshu=voteshu+1 where votexiang='".$_POST["vote"]."'";
mysql_query($sql,$connec);
echo("<script type='text/javascript'> alert('添加成功！');location.href='index.php';</script>");
}else{
echo("<script type='text/javascript'> alert('没有进行投票项目选择！');location.href='index.php';</script>");
}
?>
23、在线调查查看结果页面参考代码
<p align="center">欢迎查看投票结果</p>
<?php
$sql="select * from votexiang where vc_id=".$_GET["id"];
$conn=mysql_query($sql,$connec);
?>
<table width="600" border="1" bordercolordark="#0000CC" bordercolorlight="#FFFFFF" cellspacing="0" cellpadding="0">
<tr>
<td width="103" height="25"><div align="center"><span class="STYLE1">项目名称</span></div></td>
<td width="89" height="25"><div align="center"><span class="STYLE1">票数</span></div></td>
<td width="408" height="25"><div align="center"><span class="STYLE1">比例</span></div></td>
</tr>
<?php
$sum=0;
while($rs=mysql_fetch_array($conn)){
$sum+=$rs["voteshu"];
}
$conn=mysql_query($sql,$connec);
while($rs1=mysql_fetch_array($conn)){
$voteshu=(int)($rs1["voteshu"]/$sum*100);
$pic_width=$voteshu*778/100;
?>
<tr>
<td height="25"><?=$rs1["votexiang"]?></td>
<td height="25"><?=$rs1["voteshu"]?></td>
<td height="25"><img src="images/left1.gif" height="20" width="<?=$pic_width?>">
<?=$voteshu?>%
</td>
</tr>
<?php }?>
</table>
24、对输出的内容进行判断，从而输出其它结果
<?php
if ($rs["active"]==1) {
echo "<font color='#ff0000'>激活</font>";
}else{
echo "禁用";
}
?>
25、 限制标题字数的：
<?=substrgb($rs1["news_title"],26)?>
