PHP常用代码用法示例

内容摘要
这篇文章主要为大家详细介绍了PHP常用代码用法示例,具有一定的参考价值,可以用来参考一下。

对此感兴趣的朋友,看看idc笔记做的技术笔记!1、连接MYSQL数据库代码<?php$connec=m
文章正文

这篇文章主要为大家详细介绍了PHP常用代码用法示例,具有一定的参考价值,可以用来参考一下。

对此感兴趣的朋友,看看idc笔记做的技术笔记!

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$queryString>尾页</a& amp; gt;";}?>2)两个调用第一个<?php$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}?><?phpshowpage(); //显示页?><?phpmysql_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<?phpecho("<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<?phpmysql_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,$connec);echo("<script type='text/javascript'> alert('删除成功!');location.href='../index.php';</script>");?>10、 如何进行会员登录验证<?phpsession_start();$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=$username;echo("<script type='text/javascript'> alert('登录成功!');location.href='admin.php';</script>");}else{echo("<script type='text/javascript'> alert('你输入的用户名或密码错误,请重新输入!');location.href='login.php';</script& gt;");}mysql_close();?>11、如何对SESSION进行检验(后台检查页面的制作)<?phpsession_start();if(!isset($_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$i=1;?><table><tr><?phpwhile($rs=mysql_fetch_array($conn)){?><td>被循环的其它表格和输出</td><?phpif ($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)>1217、 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 ($textarea=="" or strlen(textarea)>150) {echo "<SCRIPT language=JavaScript>alert('个人说明为150个字符');";echo"this.location.href='vbscript:history.back()';</SCRIPT>";}24、对输出的内容进行判断,从而输出其它结果<?phpif ($rs["active"]==1) {echo "<font color='#ff0000'>激活</font>";}else{echo "禁用";}?>25.字符截取函数<?=substr("$rs[zixun_biaoti]",0,28)?>26.男女问题或单选带选择的<input type="radio" name="hy_zhuangtai" value="男" <?php if ($rs["hy_zhungtai"]==="男") { echo "checked";}?>>男<input type="radio" name="hy_zhuangtai" value="女" <?php if ($rs["hy_zhuangtai"]==="女") { echo "checked";}?>>女27.单选不带单选框的<?php if ($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>29.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>30.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>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"><!-- Beginself.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 onm ouseout=start() onm ouseover=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,不能复制作!<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.随机变换背景图象(一个可以刷新心情的特效)<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>38.划过链接 手型鼠标style="cursor:hand"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; background-color:#eeeeee;"><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.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>45.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>

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