PHP原始为Personal Home Page的缩写，已经正式更名为 "PHP: Hypertext Preprocessor"。本文特意为大家收集整理了PHP常用代码大全，希望大家喜欢！
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($page>0)echo "首页";
if($startpage>0)
echo " ... ?";
for($i=$startpage;$i<=$endpage;$i++)
{
if($i==$page) echo " [".($i+1)."] ";
else echo " ".($i+1)." ";
}
if($endpage<$pages)
echo "? ... ";
if($page<$pages)
echo "尾页";
}
//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($page>0)echo "首页";
if($startpage>0)
echo " ... ?";
for($i=$startpage;$i<=$endpage;$i++)
{
if($i==$page) echo " [".($i+1)."] ";
else echo " ".($i+1)." ";
}
if($endpage<$pages)
echo "? ... ";
if($page<$pages)
被循环的其它表格和输出
|
15、 给下拉列表框绑定数据(并且在修改时默认选中)
<?php
$sql="select * from fenleibiao";
$conn=mysql_query($sql,$connec);
while($rs1=mysql_fetch_array($conn)){
?>
<?
if ($rs["fenleiid"]==$rs1["fenleiid"]){
echo "selected" ;
}
?>>
<?=$rs1["flname"]?>
<?php>
}
?>
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($c=="") break;
if(ord($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 ($d i z h i="") {
echo "<script language=JavaScript>alert('住址不能为空');";
echo"this.location.href='vbscript:history.back()';</script>";
}
if ($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
<?php
if ($rs["active"]==1) {
echo "激活";
}else{
echo "禁用";
}
?>
25.字符截取函数
<?=substr("$rs[zixun_biaoti]",0,28)?>
26.男女问题或单选带选择的
>男
>女
27.单选不带单选框的
<?php if ($rs['hy_zhuangtai']=='锁定'){?>
<?php }
else{?>
<?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'){
$sql="hybiao set hy_zhuangtai='锁定' where hy_id='$id'";
$query=mysql_query($sql,$connec);
echo("<script type='text/javascript'>location.href='UserManage.php';</script>");
}
else{
$sql="hybiao set hy_zhuangtai='正常' where hy_id='$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