内容：
复制代码 代码如下:
<?
function GetIP() { //获取IP
if ($_SERVER["HTTP_X_FORWARDED_FOR"])
$ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
else if ($_SERVER["HTTP_CLIENT_IP"])
$ip = $_SERVER["HTTP_CLIENT_IP"];
else if ($_SERVER["REMOTE_ADDR"])
$ip = $_SERVER["REMOTE_ADDR"];
else if (getenv("HTTP_X_FORWARDED_FOR"))
$ip = getenv("HTTP_X_FORWARDED_FOR");
else if (getenv("HTTP_CLIENT_IP"))
$ip = getenv("HTTP_CLIENT_IP");
else if (getenv("REMOTE_ADDR"))
$ip = getenv("REMOTE_ADDR");
else
$ip = "Unknown";
return $ip;
}
?>

复制代码 代码如下:
<?php
function DateAdd($date, $int, $unit = "d") { //时间的增加（还可以改进成时分秒都可以增加，有时间再补上）
$dateArr = explode("-", $date);
$value[$unit] = $int;
return date("Y-m-d", mktime(0,0,0, $dateArr[1] + $value["m"], $dateArr[2] + $value["d"], $dateArr[0] + $value["y"]));
}
function GetWeekDay($date) { //计算出给出的日期是星期几
$dateArr = explode("-", $date);
return date("w", mktime(0,0,0,$dateArr[1],$dateArr[2],$dateArr[0]));
}
?>

复制代码 代码如下:
<?
function check_date($date) { //检查日期是否合法日期
$dateArr = explode("-", $date);
if (is_numeric($dateArr[0]) && is_numeric($dateArr[1]) && is_numeric($dateArr[2])) {
return checkdate($dateArr[1],$dateArr[2],$dateArr[0]);
}
return false;
}
function check_time($time) { //检查时间是否合法时间
$timeArr = explode(":", $time);
if (is_numeric($timeArr[0]) && is_numeric($timeArr[1]) && is_numeric($timeArr[2])) {
if (($timeArr[0] >= 0 && $timeArr[0] <= 23) && ($timeArr[1] >= 0 && $timeArr[1] <= 59) && ($timeArr[2] >= 0 && $timeArr[2] <= 59))
return true;
else
return false;
}
return false;
}

复制代码 代码如下:
function DateDiff($date1, $date2, $unit = "") { //时间比较函数，返回两个日期相差几秒、几分钟、几小时或几天
switch ($unit) {
case "s":
$dividend = 1;
break;
case "i":
$dividend = 60;
break;
case "h":
$dividend = 3600;
break;
case "d":
$dividend = 86400;
break;
default:
$dividend = 86400;
}
$time1 = strtotime($date1);
$time2 = strtotime($date2);
if ($time1 && $time2)
return (float)($time1 - $time2) / $dividend;
return false;
}
?>

PHP重定向
复制代码 代码如下:
<?
方法一：header("Location: index.php");
方法二：echo "<scrīpt>window.location ="$PHP_SELF";</scrīpt>";
方法三：echo "<META HTTP-EQUIV="Refresh" CONTENT="0; URL=index.php">";
?>

获取访问者浏览器
复制代码 代码如下:
<?
function browse_infor()
{
$browser="";$browserver="";
$Browsers =array("Lynx","MOSAIC","AOL","Opera","JAVA","MacWeb","WebExplorer","OmniWeb");
$Agent = $GLOBALS["HTTP_USER_AGENT"];
for ($i=0; $i<=7; $i++)
{
if (strpos($Agent,$Browsers[$i]))
{
$browser = $Browsers[$i];
$browserver ="";
}
}
if (ereg("Mozilla",$Agent) && !ereg("MSIE",$Agent))
{
$temp =explode("(", $Agent); $Part=$temp[0];
$temp =explode("/", $Part); $browserver=$temp[1];
$temp =explode(" ",$browserver); $browserver=$temp[0];
$browserver =preg_replace("/([d.]+)/","1",$browserver);
$browserver = " $browserver";
$browser = "Netscape Navigator";
}
if (ereg("Mozilla",$Agent) && ereg("Opera",$Agent))
{
$temp =explode("(", $Agent); $Part=$temp[1];
$temp =explode(")", $Part); $browserver=$temp[1];
$temp =explode(" ",$browserver);$browserver=$temp[2];
$browserver =preg_replace("/([d.]+)/","1",$browserver);
$browserver = " $browserver";
$browser = "Opera";
}
if (ereg("Mozilla",$Agent) && ereg("MSIE",$Agent))
{
$temp = explode("(", $Agent); $Part=$temp[1];
$temp = explode(";",$Part); $Part=$temp[1];
$temp = explode(" ",$Part);$browserver=$temp[2];
$browserver =preg_replace("/([d.]+)/","1",$browserver);
$browserver = " $browserver";
$browser = "Internet Explorer";
}
if ($browser!="")
{
$browseinfo = "$browser$browserver";
}
else
{
$browseinfo = "Unknown";
}
return $browseinfo;
}
//调用方法$browser=browseinfo() ;直接返回结果
?>

获取访问者操作系统
复制代码 代码如下:
<?
function osinfo() {
$os="";
$Agent = $GLOBALS["HTTP_USER_AGENT"];
if (eregi("win",$Agent) && strpos($Agent, "95")) {
$os="Windows 95";
}
elseif (eregi("win 9x",$Agent) && strpos($Agent, "4.90")) {
$os="Windows ME";
}
elseif (eregi("win",$Agent) && ereg("98",$Agent)) {
$os="Windows 98";
}
elseif (eregi("win",$Agent) && eregi("nt 5.0",$Agent)) {
$os="Windows 2000";
}
elseif (eregi("win",$Agent) && eregi("nt",$Agent)) {
$os="Windows NT";
}
elseif (eregi("win",$Agent) && eregi("nt 5.1",$Agent)) {
$os="Windows XP";
}
elseif (eregi("win",$Agent) && ereg("32",$Agent)) {
$os="Windows 32";
}
elseif (eregi("linux",$Agent)) {
$os="Linux";
}
elseif (eregi("unix",$Agent)) {
$os="Unix";
}
elseif (eregi("sun",$Agent) && eregi("os",$Agent)) {
$os="SunOS";
}
elseif (eregi("ibm",$Agent) && eregi("os",$Agent)) {
$os="IBM OS/2";
}
elseif (eregi("Mac",$Agent) && eregi("PC",$Agent)) {
$os="Macintosh";
}
elseif (eregi("PowerPC",$Agent)) {
$os="PowerPC";
}
elseif (eregi("AIX",$Agent)) {
$os="AIX";
}
elseif (eregi("HPUX",$Agent)) {
$os="HPUX";
}
elseif (eregi("NetBSD",$Agent)) {
$os="NetBSD";
}
elseif (eregi("BSD",$Agent)) {
$os="BSD";
}
elseif (ereg("OSF1",$Agent)) {
$os="OSF1";
}
elseif (ereg("IRIX",$Agent)) {
$os="IRIX";
}
elseif (eregi("FreeBSD",$Agent)) {
$os="FreeBSD";
}
if ($os=="") $os = "Unknown";
return $os;
}
//调用方法$os=os_infor() ;
?>

文件格式类
复制代码 代码如下:
<?
$mime_types = array(
"gif" => "image/gif",
"jpg" => "image/jpeg",
"jpeg" => "image/jpeg",
"jpe" => "image/jpeg",
"bmp" => "image/bmp",
"png" => "image/png",
"tif" => "image/tiff",
"tiff" => "image/tiff",
"pict" => "image/x-pict",
"pic" => "image/x-pict",
"pct" => "image/x-pict",
"tif" => "image/tiff",
"tiff" => "image/tiff",
"psd" => "image/x-photoshop",
"swf" => "application/x-shockwave-flash",
"js" => "application/x-javascrīpt",
"pdf" => "application/pdf",
"ps" => "application/postscrīpt",
"eps" => "application/postscrīpt",
"ai" => "application/postscrīpt",
"wmf" => "application/x-msmetafile",
"css" => "text/css",
"htm" => "text/html",
"html" => "text/html",
"txt" => "text/plain",
"xml" => "text/xml",
"wml" => "text/wml",
"wbmp" => "image/vnd.wap.wbmp",
"mid" => "audio/midi",
"wav" => "audio/wav",
"mp3" => "audio/mpeg",
"mp2" => "audio/mpeg",
"avi" => "video/x-msvideo",
"mpeg" => "video/mpeg",
"mpg" => "video/mpeg",
"qt" => "video/quicktime",
"mov" => "video/quicktime",
"lha" => "application/x-lha",
"lzh" => "application/x-lha",
"z" => "application/x-compress",
"gtar" => "application/x-gtar",
"gz" => "application/x-gzip",
"gzip" => "application/x-gzip",
"tgz" => "application/x-gzip",
"tar" => "application/x-tar",
"bz2" => "application/bzip2",
"zip" => "application/zip",
"arj" => "application/x-arj",
"rar" => "application/x-rar-compressed",
"hqx" => "application/mac-binhex40",
"sit" => "application/x-stuffit",
"bin" => "application/x-macbinary",
"uu" => "text/x-uuencode",
"uue" => "text/x-uuencode",
"latex"=> "application/x-latex",
"ltx" => "application/x-latex",
"tcl" => "application/x-tcl",
"pgp" => "application/pgp",
"asc" => "application/pgp",
"exe" => "application/x-msdownload",
"doc" => "application/msword",
"rtf" => "application/rtf",
"xls" => "application/vnd.ms-excel",
"ppt" => "application/vnd.ms-powerpoint",
"mdb" => "application/x-msaccess",
"wri" => "application/x-mswrite",
);
?>

php生成excel文档
复制代码 代码如下:
<?
header("Content-type:application/vnd.ms-excel");
header("Content-Disposition:filename=test.xls");
echo "test1t";
echo "test2tn";
echo "test1t";
echo "test2tn";
echo "test1t";
echo "test2tn";
echo "test1t";
echo "test2tn";
echo "test1t";
echo "test2tn";
echo "test1t";
echo "test2tn";
//改动相应文件头就可以输出.doc .xls等文件格式了
?>

时间比较问题
举一个简单例子说明:比如一个论坛对当天发表的贴子用new图片标记一下。
方法一：
复制代码 代码如下:
<?
//$db->rows[$i][date]中为数据库中datetime字段值.
$today=time();
$theDay=date("Y-m-d H:i:s",$today-24*3600);
$newTag=$db->rows[$i][date]>=$theDay?"<img src="../image/newinfor.gif">":"";
//方法二：
$newTag=$db->rows[$i][date]>=date("Y-m-d 00:00:00")?"<img src="../image/newinfor.gif">":"";
?>

复制代码 代码如下:
//提取页面和浏览器提交的变量，作用相当于使PHP.INI开了全局变量
<?
@extract($_SERVER, EXTR_SKIP);
@extract($_SESSION, EXTR_SKIP);
@extract($_POST, EXTR_SKIP);
@extract($_FILES, EXTR_SKIP);
@extract($_GET, EXTR_SKIP);
@extract($_ENV, EXTR_SKIP);
?>

复制代码 代码如下:
//读取文件函数
<?
function readfromfile($file_name) {
if (file_exists($file_name)) {
$filenum=fopen($file_name,"r");
flock($filenum,LOCK_EX);
$file_data=fread($filenum, filesize($file_name));
rewind($filenum);
fclose($filenum);
return $file_data;
}
}
?>

复制代码 代码如下:
//写入文件函数
<?
function writetofile($file_name,$data,$method="w") {
$filenum=fopen($file_name,$method);
flock($filenum,LOCK_EX);
$file_data=fwrite($filenum,$data);
fclose($filenum);
return $file_data;
}
?>

复制代码 代码如下:
//页面快速转向
<?
function turntopage($url="index.php",$info = "页面转向中...",$second=2){
print "<html>n<head>n<title>页面转向中....</title>n";
print "<meta http-equiv="refresh" content="$second;url=$url">n";
print "<style type="text/css">n<!--n";
print "td { font-family: "Verdana", "Arial";font-size: 12px}n";
print "A {COLOR: #000000; TEXT-DECORATION: none}n";
print "-->n</style>n";
print "</head>n<body>n";
print "<table width="100%" border="0" align="center">n";
print " <tr>n";
print " <td height="200"> </td>n";
print " </tr>n";
print " <tr>n";
print " <td align="center">n";
print " <table width="60%" border="0" cellpadding="8" bgcolor="#AA9FFF">n";
print " <tr>n";
print " <td height="30" align="center">页面转向提示信息</td>n";
print " </tr>n";
print " <tr>n";
print " <td align="center">$info</td>n";
print " </tr>n";
print " <tr>n";
print " <td align="center">n";
print " <a href="$url">如果你的浏览器不支持自动跳转,请按这里</a></td>n";
print " </tr>n";
print " </tr>n";
print " </table></td>n";
print " </tr>n";
print " <tr>n";
print " <td height="200"> </td>n";
print " </tr>n";
print "</table>n";
print "</body>n</html>";
exit;
?>

产生随机字符串函数
复制代码 代码如下:
<?
function random($length) {
$hash = @#@#;
$chars = @#ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz@#;
$max = strlen($chars) - 1;
mt_srand((double)microtime() * 1000000);
for($i = 0; $i < $length; $i++) {
$hash .= $chars[mt_rand(0, $max)];
}
return $hash;
}
?>

截取一定长度的字符串（该函数对GB2312使用有效）
复制代码 代码如下:
<?
function Wordscut($string, $length ,$sss=0) {
if(strlen($string) > $length) {
if($sss){
$length=$length - 3;
$addstr=@# ...@#;
}
for($i = 0; $i < $length; $i++) {
if(ord($string[$i]) > 127) {
$wordscut .= $string[$i].$string[$i + 1];
$i++;
} else {
$wordscut .= $string[$i];
}
}
return $wordscut.$addstr;
}
return $string;
}
?>

取得客户端IP地址
复制代码 代码如下:
<?
function GetIP(){
if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
$ip = getenv("HTTP_CLIENT_IP");
else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
$ip = getenv("HTTP_X_FORWARDED_FOR");
else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
$ip = getenv("REMOTE_ADDR");
else if (isset($_SERVER[@#REMOTE_ADDR@#]) && $_SERVER[@#REMOTE_ADDR@#] && strcasecmp($_SERVER[@#REMOTE_ADDR@#], "unknown"))
$ip = $_SERVER[@#REMOTE_ADDR@#];
else
$ip = "unknown";
return($ip);
}
?>

判断邮箱地址
复制代码 代码如下:
<?
function checkEmail($inAddress)
{
return (ereg("^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+",$inAddress));
}
?>

分页（两个函数配合使用）
复制代码 代码如下:
<?
function getpage($sql,$page_size=20)
{
global $page,$totalpage,$sums; //out param
$page = $_GET["page"];
//$eachpage = $page_size;
$pagesql = strstr($sql," from ");
$pagesql = "select count(*) as ids ".$pagesql;
$result = mysql_query($pagesql);
if($rs = mysql_fetch_array($result)) $sums = $rs[0];
$totalpage = ceil($sums/$page_size);
if((!$page)($page<1)) $page=1;
$startpos = ($page-1)*$page_size;
$sql .=" limit $startpos,$page_size ";
return $sql;
}
function showbar($string="")
{
global $page,$totalpage;
$out="共<font ".$totalpage."color=@#red@#><b>".$totalpage."</b></font>页 ";
$linkNum =4;
$start = ($page-round($linkNum/2))>0 ? ($page-round($linkNum/2)) : "1";
$end = ($page+round($linkNum/2))<$totalpage ? ($page+round($linkNum/2)) : $totalpage;
$prestart=$start-1;
$nextend=$end+1;
if($page<>1)
$out .= "<a href=@#?page=1&&".$string."@#title=第一页>第一页</a> ";
if($start>1)
$out.="<a href=@#?page=".$prestart."@# title=上一页>..<<</a> ";
for($t=$start;$t<=$end;$t++)
{
$out .= ($page==$t) ? "<font [".$t."]color=@#red@#><b>[".$t."]</b></font> " : "<a $thref=@#?page=$t&&".$string."@#>$t</a> ";
}
if($end<$totalpage)
$out.="<a href=@#?page=".$nextend."&&".$string."@# title=下一页>>>..</a>";
if($page<>$totalpage)
$out .= " <a href=@#?page=".$totalpage."&&".$string."@# title=最后页>最后页</a>";
return $out;
}
?>

获取新插入数据的ID
复制代码 代码如下:
<?
mysql_insert_id();
?>

复制代码 代码如下:
//获得当前的脚本网址
<?
function get_php_url(){
if(!empty($_server["REQUEST_URI"])){
$scriptName = $_SERVER["REQUEST_URI"];
$nowurl = $scriptName;
}else{
$scriptName = $_SERVER["PHP_SELF"];
if(empty($_SERVER["QUERY_STRING"])) $nowurl = $scriptName;
else $nowurl = $scriptName."?".$_SERVER["QUERY_STRING"];
}
return $nowurl;
}
?>

复制代码 代码如下:
//把全角数字转为半角数字
<?
function GetAlabNum($fnum){
$nums = array("０","１","２","３","４","５","６","７","８","９");
$fnums = "0123456789";
for($i=0;$i<=9;$i++) $fnum = str_replace($nums[$i],$fnums[$i],$fnum);
$fnum = ereg_replace("[^0-9.]|^0{1,}","",$fnum);
if($fnum=="") $fnum=0;
return $fnum;
}
?>

复制代码 代码如下:
//去除HTML标记
<?
function Text2Html($txt){
$txt = str_replace(" ","　",$txt);
$txt = str_replace("<","<",$txt);
$txt = str_replace(">",">",$txt);
$txt = preg_replace("/[rn]{1,}/isU","
rn",$txt);
return $txt;
}
?>

复制代码 代码如下:
//相对路径转化成绝对路径
<?
function relative_to_absolute($content, $feed_url) {
preg_match("/(http|https|ftp):///", $feed_url, $protocol);
$server_url = preg_replace("/(http|https|ftp|news):///", "", $feed_url);
$server_url = preg_replace("//.*/", "", $server_url);
if ($server_url == "") {
return $content;
}
if (isset($protocol[0])) {
$new_content = preg_replace("/href="//", "href="".$protocol[0].$server_url."/", $content);
$new_content = preg_replace("/src="//", "src="".$protocol[0].$server_url."/", $new_content);
} else {
$new_content = $content;
}
return $new_content;
}
?>

复制代码 代码如下:
//取得所有链接
<?
function get_all_url($code){
preg_match_all("/<as+href=["|"]?([^>"" ]+)["|"]?s*[^>]*>([^>]+)</a>/i",$code,$arr);
return array("name"=>$arr[2],"url"=>$arr[1]);
}
?>

复制代码 代码如下:
//HTML表格的每行转为CSV格式数组
<?
function get_tr_array($table) {
$table = preg_replace(""<td[^>]*?>"si",""",$table);
$table = str_replace("</td>","",",$table);
$table = str_replace("</tr>","{tr}",$table);
//去掉 HTML 标记
$table = preg_replace(""<[/!]*?[^<>]*?>"si","",$table);
//去掉空白字符
$table = preg_replace(""([rn])[s]+"","",$table);
$table = str_replace(" ","",$table);
$table = str_replace(" ","",$table);
$table = explode(",{tr}",$table);
array_pop($table);
return $table;
}
?>

复制代码 代码如下:
//将HTML表格的每行每列转为数组，采集表格数据
<?
function get_td_array($table) {
$table = preg_replace(""<table[^>]*?>"si","",$table);
$table = preg_replace(""<tr[^>]*?>"si","",$table);
$table = preg_replace(""<td[^>]*?>"si","",$table);
$table = str_replace("</tr>","{tr}",$table);
$table = str_replace("</td>","{td}",$table);
//去掉 HTML 标记
$table = preg_replace(""<[/!]*?[^<>]*?>"si","",$table);
//去掉空白字符
$table = preg_replace(""([rn])[s]+"","",$table);
$table = str_replace(" ","",$table);
$table = str_replace(" ","",$table);
$table = explode("{tr}", $table);
array_pop($table);
foreach ($table as $key=>$tr) {
$td = explode("{td}", $tr);
array_pop($td);
$td_array[] = $td;
}
return $td_array;
}
?>

复制代码 代码如下:
//返回字符串中的所有单词 $distinct=true 去除重复
<?
function split_en_str($str,$distinct=true) {
preg_match_all("/([a-zA-Z]+)/",$str,$match);
if ($distinct == true) {
$match[1] = array_unique($match[1]);
}
sort($match[1]);
return $match[1];
}
?>

复制代码 代码如下:
//打印出为本PHP项目做出贡献的人员的清单
<?
string phpcredits(void)
?>