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PHP常用代码大全(新手入门必备)
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PHP常用代码大全(新手入门必备)，都是一些开发中常用的基础。需要的朋友可以参考下。
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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($conn)){
?>
循环的内容.........
<?php
}
?>
3、如何实现分页，包括两个函数，两个调用
//分页函数
function genpage(&$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& amp; gt;";
}
?>
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，并发生页面自动跳转
<?php
echo("<script type=‘text/javascript‘> alert(‘添加成功！‘);location.href=‘index.php‘;</script>");
?>
7、 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& gt;");
}
mysql_close();
?>
11、检验是否设置SESSION
<?php
session_start();
if(!isset($_SESSION["admin"])){
header("location:login.php");
exit;
}
?>
12、 javascript 验证用户名及密码是否填写
<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、 下拉列表框绑定数据(并默认选中)
<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" ;
}
?>>
<?=$rs1["flname"]?>
</option>
<?php>
}
?>
</select>
17、 定义一个字符截取函数
用法：<?=substrgb($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 $out;
}
20、PHP注册验证
if ($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>";
}
27.单选不带单选框
<?php if ($rs[‘hy_zhuangtai‘]==‘锁定‘){?>
<a href="Userzt.php?action=yes&id=<?php echo $rs[‘hy_id‘];?>">锁定</a>
<?php }
else{?>
<a href="Userzt.php?id=<?php echo $rs[‘hy_id‘];?>&action=no">解锁</a>
<?php }?>
它的 save页是
<?php require_once(‘http://www.cnblogs.com/conn.php‘); ?>
<?php
$hy_id=$_GET[‘id‘];
$action=$_GET[‘action‘];
if ($action==‘yes‘){
$sql="update hybiao set hy_zhuangtai=‘锁定‘ where hy_id=‘$id‘";
$query=mysql_query($sql,$connec);
echo("<script type=‘text/javascript‘>location.href=‘UserManage.php‘;</script>");
}
else{
$sql="update hybiao set hy_zhuangtai=‘正常‘ where hy_id=‘$id‘";
$query=mysql_query($sql,$connec);
echo("<script type=‘text/javascript‘>location.href=‘UserManage.php‘;</script>");
}
mysql_close();
?>
28. 如果文字过长,则将过长的部分变成省略号显示
<DIV STYLE="width: 120px; height: 50px; border: 0px solid blue;overflow: hidden; text-overflow:ellipsis">
<NOBR> 就是比如有一行文字，很长，表格内一行显示不下.</NOBR>
</DIV>
30.添加到收藏夹和设为首页
<a href=# onclick="this.style.behavior=‘url(#default#homepage)‘; this.setHomePage(‘http://www.makewing.com/lanren/‘);">设为首页</a>
<a href="javascript:window.external.AddFavorite(‘http://www.makewing.com /lanren/‘,‘懒人图库‘)">收藏本站</a>
31.记录并显示网页的最后修改时间
<script language=JavaScript>
document.write("最后更新时间: " + document.lastModified + "")
</script>
32.节日倒计时
<Script Language="JavaScript">
var timedate= new Date("October 1,2002");
var times= "国庆节";
var now = new Date();
var date = timedate.getTime() - now.getTime();
var time = Math.floor(date / (1000 * 60 * 60 * 24));
if (time >= 0)
document.write( "现在离"+times+"还有: "+time +"天")
</Script>
33.打开窗口即最大化
<script language="JavaScript">
<!-- Begin
self.moveTo(0,0)
self.resizeTo(screen.availWidth,screen.availHeight)
// End -->
</script>
34.加入背景音乐
<bgsound src="mid/windblue[1].mid" loop="-1"> 只适用于IE
<embed src="music.mid" autostart="true" loop="true" hidden="true"> 对Netscape ,IE 都适用
35. 滚动
<marquee direction=up height=146 onmouseout=start() onmouseover=stop() scrollAmount=2>
滚动信息
</marquee>
36.防止点击空链接时，页面往往重置到页首端
代码“javascript:void(null)”代替原来的“#”标记
37.不能点右键，不用CTRL+A，不能复制!
<body oncontextmenu="window.event.returnValue=false"
onkeypress="window.event.returnValue=false"
onkeydown="window.event.returnValue=false"
onkeyup="window.event.returnValue=false"
ondragstart="window.event.returnValue=false"
onselectstart="event.returnValue=false">
</body>
37. Js随机变换背景图象（刷新心情的特效）
<Script Language="JavaScript">
image = new Array(4); //定义image为图片数量的数组
image [0] = ‘tu0.gif‘ //背景图象的路径
image [1] = ‘tu1.gif‘
image [2] = ‘tu2.gif‘
image [3] = ‘tu3.gif‘
image [4] = ‘tu4.gif‘
number = Math.floor(Math.random() * image.length);
document.write("<BODY BACKGROUND="+image[number]+">");
</Script>
39.如何关闭层
<div id="Layer1"></div>
<a href="#" onClick="Layer1.style.display=‘none‘">关闭层</a>
40.<a href=javascript:close()>[关闭窗口]</a>
41.凹陷文字背景为灰色
<div style="width:300px;padding:20px;overflow:hidden;word-wrap:break-word;word- break:break:all; font-size:12px; line-height:18px; ">
<font disabled>
怎么样，我凹下去了吧？<br>
你不想试试吗？<br>
<a href="www.lenvo.cnhttp://www.lenvo.cn/">www.lenvo.cn</a></font>
</div>
42.给表格做链接
<table width="100%" onclick="window.open(‘http://www.makewing.com/‘, ‘_blank‘)" style="CURSOR:hand">
<tr>
<td height="100" bgcolor="f4f4f4"> </td>
</tr>
</table>
43.后退&关闭窗口
后退：javascript:history.back(1)
关闭：javascript:window.close();
44.禁止复制，鼠标拖动选取
<body ondragstart=window.event.returnValue=false oncontextmenu=window.event.returnValue=false onselectstart=event.returnValue=false>
45.大 中 小 文字的变化
<script type="text/javascript">
function doZoom(size)
{document.getElementById(‘zoom‘).style.fontSize=size+‘px‘;}
</script>
<span id="zoom">需要指定大小的文字</span>
<a href="javascript:doZoom(16)">大</a> <a href="javascript:doZoom(14)">中</a> <a href="javascript:doZoom(12)">小</a>
标签：des style blog http color os io java ar
原文地址：http://www.cnblogs.com/xthphp/p/3951325.html
