php常用函数 精选
<?
function GetIP() { //获取IP
if ($_SERVER["HTTP_X_FORWARDED_FOR"])
$ip = $_SERVER["HTTP_X_FORWARDED_FOR"]; //OSPHP.com.CN
else if ($_SERVER["HTTP_CLIENT_IP"])
$ip = $_SERVER["HTTP_CLIENT_IP"];
else if ($_SERVER["REMOTE_ADDR"])
$ip = $_SERVER["REMOTE_ADDR"]; //OsPHP.COM.CN
else if (getenv("HTTP_X_FORWARDED_FOR"))
$ip = getenv("HTTP_X_FORWARDED_FOR");
else if (getenv("HTTP_CLIENT_IP"))
$ip = getenv("HTTP_CLIENT_IP"); //PHP开源代码
else if (getenv("REMOTE_ADDR"))
$ip = getenv("REMOTE_ADDR");
else
$ip = "Unknown";
return $ip;
}
?>
//开源代码OSPHP.COM.Cn
<?php
function DateAdd($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; //OsPHP.COM.CN
return date("Y-m-d", mktime(0,0,0, $dateArr + $value['m'], $dateArr + $value['d'], $dateArr + $value['y']));
//开源OSPhP.COM.CN
}
function GetWeekDay($date) {//计算出给出的日期是星期几
$dateArr = explode("-", $date);
return date("w", mktime(0,0,0,$dateArr,$dateArr,$dateArr));
//开源代码OSPhP.COm.CN
}
?>
<?
function check_date($date) { //检查日期是否合法日期
$dateArr = explode("-", $date);
if (is_numeric($dateArr) && is_numeric($dateArr) && is_numeric($dateArr)) { //开源OSPhP.COM.CN
return checkdate($dateArr,$dateArr,$dateArr);
}
return false;
}
function check_time($time) {//检查时间是否合法时间 //OSPHP.COM.Cn开源
$timeArr = explode(":", $time);
if (is_numeric($timeArr) && is_numeric($timeArr) && is_numeric($timeArr)) {
//开源代码OSPHP.COM.Cn
if (($timeArr >= 0 && $timeArr <= 23) && ($timeArr >= 0 && $timeArr <= 59) && ($timeArr >= 0 && $timeArr <= 59))
//PHP开源代码
return true;
else
return false;
}
return false;
}
function DateDiff($date1, $date2, $unit = "") { //时间比较函数，返回两个日期相差几秒、几分钟、几小时或几天 //oSPHP.COM.CN
switch ($unit) {
case 's':
$dividend = 1;
break;
case 'i':
$dividend = 60;
//oSPHP.COM.CN
break;
case 'h':
$dividend = 3600;
break;
case 'd':
$dividend = 86400;
break; //开源代码OSPhP.COm.CN
default:
$dividend = 86400;
}
$time1 = strtotime($date1);
$time2 = strtotime($date2);
if ($time1 && $time2) //OSPHP.com.CN
return (float)($time1 - $time2) / $dividend;
return false;
}
?>
PHP重定向
<?
方法一：header("Location: index.php");
方法二：echo "<scrīpt>window.location ="$PHP_SELF";</scrīpt>"; //开源代码OSPhP.COm.CN
方法三：echo "<META HTTP-EQUIV="Refresh" CONTENT="0; URL=index.php">";
?>
获取访问者浏览器
<?
function browse_infor()
{
$browser="";$browserver=""; //OSPHP.COm.CN
$Browsers =array("Lynx","MOSAIC","AOL","Opera","JAVA","MacWeb","WebExplorer","OmniWeb");
$Agent = $GLOBALS["HTTP_USER_AGENT"];
for ($i=0; $i<=7; $i++) //开源代码OSPHP.COM.Cn
{
if (strpos($Agent,$Browsers[$i]))
{
$browser = $Browsers[$i];
$browserver ="";
}
}
if (ereg("Mozilla",$Agent) && !ereg("MSIE",$Agent)) //开源代码OSPhP.COm.CN
{
$temp =explode("(", $Agent); $Part=$temp;
$temp =explode("/", $Part); $browserver=$temp;
//OSPHP.COM.Cn开源
$temp =explode(" ",$browserver); $browserver=$temp;
$browserver =preg_replace("/(+)/","1",$browserver);
$browserver = " $browserver"; //OsPHP.COM.CN
$browser = "Netscape Navigator";
}
if (ereg("Mozilla",$Agent) && ereg("Opera",$Agent))
{
$temp =explode("(", $Agent); $Part=$temp;
//PHP开源代码
$temp =explode(")", $Part); $browserver=$temp;
$temp =explode(" ",$browserver);$browserver=$temp;
//开源代码OSPHP.COM.Cn
$browserver =preg_replace("/(+)/","1",$browserver);
$browserver = " $browserver";
$browser = "Opera";
}
if (ereg("Mozilla",$Agent) && ereg("MSIE",$Agent))
//PHP开源代码
{
$temp = explode("(", $Agent); $Part=$temp;
$temp = explode(";",$Part); $Part=$temp; //OsPHP.COM.CN
$temp = explode(" ",$Part);$browserver=$temp;
$browserver =preg_replace("/(+)/","1",$browserver);
$browserver = " $browserver"; //OSPHP.com.CN
$browser = "Internet Explorer";
}
if ($browser!="")
{
$browseinfo = "$browser$browserver";
}
else
{
$browseinfo = "Unknown";
}
return $browseinfo;
}
//调用方法$browser=browseinfo() ;直接返回结果
?> //开源OSPhP.COM.CN
获取访问者操作系统
<?
function osinfo() {
$os="";
$Agent = $GLOBALS["HTTP_USER_AGENT"];
if (eregi('win',$Agent) && strpos($Agent, '95')) { //OsPHP.COM.CN
$os="Windows 95";
}
elseif (eregi('win 9x',$Agent) && strpos($Agent, '4.90')) {
$os="Windows ME";
}
elseif (eregi('win',$Agent) && ereg('98',$Agent)) { //开源OSPhP.COM.CN
$os="Windows 98";
}
elseif (eregi('win',$Agent) && eregi('nt 5.0',$Agent)) {
$os="Windows 2000";
}
elseif (eregi('win',$Agent) && eregi('nt',$Agent)) {
//OSPHP.COM.Cn开源
$os="Windows NT";
}
elseif (eregi('win',$Agent) && eregi('nt 5.1',$Agent)) {
$os="Windows XP";
}
elseif (eregi('win',$Agent) && ereg('32',$Agent)) {
//开源OSPhP.COM.CN
$os="Windows 32";
}
elseif (eregi('linux',$Agent)) {
$os="Linux";
}
elseif (eregi('unix',$Agent)) {
$os="Unix"; //PHP开源代码
}
elseif (eregi('sun',$Agent) && eregi('os',$Agent)) {
$os="SunOS";
}
elseif (eregi('ibm',$Agent) && eregi('os',$Agent)) { //OSPHP.COm.CN
$os="IBM OS/2";
}
elseif (eregi('Mac',$Agent) && eregi('PC',$Agent)) {
$os="Macintosh";
}
elseif (eregi('PowerPC',$Agent)) { //OSPHP.com.CN
$os="PowerPC";
}
elseif (eregi('AIX',$Agent)) {
$os="AIX";
}
elseif (eregi('HPUX',$Agent)) {
$os="HPUX";
//开源代码OSPhP.COm.CN
}
elseif (eregi('NetBSD',$Agent)) {
$os="NetBSD";
}
elseif (eregi('BSD',$Agent)) {
$os="BSD";
}
elseif (ereg('OSF1',$Agent)) {
//开源代码OSPHP.COM.Cn
$os="OSF1";
}
elseif (ereg('IRIX',$Agent)) {
$os="IRIX";
}
elseif (eregi('FreeBSD',$Agent)) {
$os="FreeBSD";
//oSPHP.COM.CN
}
if ($os=='') $os = "Unknown";
return $os;
}
//调用方法$os=os_infor() ;
?>
文件格式类
<?
$mime_types = array(
'gif' => 'image/gif', //oSPHP.COM.CN
'jpg' => 'image/jpeg',
'jpeg' => 'image/jpeg',
'jpe' => 'image/jpeg',
'bmp' => 'image/bmp',
'png' => 'image/png',
'tif' => 'image/tiff', //开源代码OSPHP.COM.Cn
'tiff' => 'image/tiff',
'pict' => 'image/x-pict',
'pic' => 'image/x-pict',
'pct' => 'image/x-pict',
'tif' => 'image/tiff',
'tiff' => 'image/tiff', //oSPHP.COM.CN
'psd' => 'image/x-photoshop',
'swf' => 'application/x-shockwave-flash',
'js' => 'application/x-javascrīpt',
'pdf' => 'application/pdf',
'ps' => 'application/postscrīpt',
'eps' => 'application/postscrīpt', //开源OSPhP.COM.CN
'ai' => 'application/postscrīpt',
'wmf' => 'application/x-msmetafile',
'css' => 'text/css',
'htm' => 'text/html',
'html' => 'text/html',
'txt' => 'text/plain', //开源OSPhP.COM.CN
'xml' => 'text/xml',
'wml' => 'text/wml',
'wbmp' => 'image/vnd.wap.wbmp',
'mid' => 'audio/midi',
'wav' => 'audio/wav',
'mp3' => 'audio/mpeg', //OSPHP.com.CN
'mp2' => 'audio/mpeg',
'avi' => 'video/x-msvideo',
'mpeg' => 'video/mpeg',
'mpg' => 'video/mpeg',
'qt' => 'video/quicktime',
'mov' => 'video/quicktime', //开源OSPhP.COM.CN
'lha' => 'application/x-lha',
'lzh' => 'application/x-lha',
'z' => 'application/x-compress',
'gtar' => 'application/x-gtar',
'gz' => 'application/x-gzip',
'gzip' => 'application/x-gzip', //OSPHP.COM.Cn开源
'tgz' => 'application/x-gzip',
'tar' => 'application/x-tar',
'bz2' => 'application/bzip2',
'zip' => 'application/zip',
'arj' => 'application/x-arj',
'rar' => 'application/x-rar-compressed',
//开源代码OSPHP.COM.Cn
'hqx' => 'application/mac-binhex40',
'sit' => 'application/x-stuffit',
'bin' => 'application/x-macbinary',
'uu' => 'text/x-uuencode',
'uue' => 'text/x-uuencode',
'latex'=> 'application/x-latex',
//OSPHP.COM.Cn开源
'ltx' => 'application/x-latex',
'tcl' => 'application/x-tcl',
'pgp' => 'application/pgp',
'asc' => 'application/pgp',
'exe' => 'application/x-msdownload',
'doc' => 'application/msword',
//开源OSPhP.COM.CN
'rtf' => 'application/rtf',
'xls' => 'application/vnd.ms-excel',
'ppt' => 'application/vnd.ms-powerpoint',
'mdb' => 'application/x-msaccess',
'wri' => 'application/x-mswrite',
);
?> //OSPHP.com.CN
php生成excel文档
<?
header("Content-type:application/vnd.ms-excel");
header("Content-Disposition:filename=test.xls");
echo "test1t";
echo "test2tn";
echo "test1t";
echo "test2tn";
echo "test1t"; //PHP开源代码
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。 //PHP开源代码
方法一：
<?
//$db->rows[$i]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[$i]>=$theDay?"<img src='../image/newinfor.gif'>":""; //oSPHP.COM.CN
//方法二：
$newTag=$db->rows[$i]>=date("Y-m-d 00:00:00")?"<img src='../image/newinfor.gif'>":"";
?>
//提取页面和浏览器提交的变量，作用相当于使PHP.INI开了全局变量 //OSPHP.com.CN
<?
@extract($_SERVER, EXTR_SKIP);
@extract($_SESSION, EXTR_SKIP);
@extract($_POST, EXTR_SKIP);
@extract($_FILES, EXTR_SKIP); //开源OSPhP.COM.CN
@extract($_GET, EXTR_SKIP);
@extract($_ENV, EXTR_SKIP);
?>
//读取文件函数
<?
function readfromfile($file_name) {
if (file_exists($file_name)) { //OSPHP.COM.Cn开源
$filenum=fopen($file_name,"r");
flock($filenum,LOCK_EX);
$file_data=fread($filenum, filesize($file_name));
rewind($filenum); //OSPHP.COm.CN
fclose($filenum);
return $file_data;
}
}
?>
//写入文件函数
<?
function writetofile($file_name,$data,$method="w") {
$filenum=fopen($file_name,$method); //OSPHP.COm.CN
flock($filenum,LOCK_EX);
$file_data=fwrite($filenum,$data);
fclose($filenum);
return $file_data;
}
?>
//开源代码OSPHP.COM.Cn
//页面快速转向
<?
function turntopage($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"; //开源代码OSPHP.COM.Cn
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";
//oSPHP.COM.CN
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";
//开源代码OSPHP.COM.Cn
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">$info</td>n";
print " </tr>n";
print " <tr>n";
//OSPHP.com.CN
print " <td align="center">n";
print " <a href="$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"; //开源OSPhP.COM.CN
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
<?
function random($length) {
$hash = @#@#;
$chars = @#ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz@#; //oSPHP.COM.CN
$max = strlen($chars) - 1;
mt_srand((double)microtime() * 1000000);
for($i = 0; $i < $length; $i++) { //开源代码OSPHP.COM.Cn
$hash .= $chars;
}
return $hash;
}
?>
截取一定长度的字符串（该函数对GB2312使用有效）
<?
function Wordscut($string, $length ,$sss=0) { //OSPHP.com.CN
if(strlen($string) > $length) {
if($sss){
$length=$length - 3;
$addstr=@# ...@#;
//OSPHP.COM.Cn开源
}
for($i = 0; $i < $length; $i++) {
if(ord($string[$i]) > 127) {
$wordscut .= $string[$i].$string[$i + 1]; //oSPHP.COM.CN
$i++;
} else {
$wordscut .= $string[$i];
}
}
return $wordscut.$addstr;
}
return $string;
}
?>
取得客户端IP地址
<? //开源代码OSPhP.COm.CN
function GetIP(){
if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
$ip = getenv("HTTP_CLIENT_IP"); //OSPHP.COM.Cn开源
else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
$ip = getenv("HTTP_X_FORWARDED_FOR"); //OSPHP.com.CN
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"))
//OSPHP.COm.CN
$ip = $_SERVER[@#REMOTE_ADDR@#];
else
$ip = "unknown";
return($ip);
}
?>
//开源代码OSPhP.COm.CN
判断邮箱地址
<?
function checkEmail($inAddress)
{
return (ereg("^()+@()+(.)+",$inAddress));
}
?>
分页（两个函数配合使用）
<?
function getpage($sql,$page_size=20) //开源代码OSPhP.COm.CN
{
global $page,$totalpage,$sums;//out param
$page = $_GET["page"];
//$eachpage = $page_size;
$pagesql = strstr($sql," from ");
//oSPHP.COM.CN
$pagesql = "select count(*) as ids ".$pagesql;
$result = mysql_query($pagesql);
if($rs = mysql_fetch_array($result)) $sums = $rs;
//PHP开源代码
$totalpage = ceil($sums/$page_size);
if((!$page)($page<1)) $page=1;
$startpos = ($page-1)*$page_size; //OsPHP.COM.CN
$sql .=" limit $startpos,$page_size ";
return $sql;
}
function showbar($string="")
{
global $page,$totalpage;
$out="共<font ".$totalpage."color=@#red@#><b>".$totalpage."</b></font>页"; //OsPHP.COM.CN
$linkNum =4;
$start = ($page-round($linkNum/2))>0 ? ($page-round($linkNum/2)) : "1"; //OSPHP.com.CN
$end = ($page+round($linkNum/2))<$totalpage ? ($page+round($linkNum/2)) : $totalpage;
$prestart=$start-1; //OSPHP.com.CN
$nextend=$end+1;
if($page<>1)
$out .= "<a href=@#?page=1&&".$string."@#title=第一页>第一页</a> ";
if($start>1) //OSPHP.COm.CN
$out.="<a href=@#?page=".$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> "; //oSPHP.COM.CN
}
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>"; //OSPHP.COM.Cn开源
return $out;
}
?>
获取新插入数据的ID
<?
mysql_insert_id();
?>
//获得当前的脚本网址
<?
function get_php_url(){
if(!empty($_server["REQUEST_URI"])){ //开源代码OSPhP.COm.CN
$scriptName = $_SERVER["REQUEST_URI"];
$nowurl = $scriptName;
}else{
$scriptName = $_SERVER["PHP_SELF"]; //OsPHP.COM.CN
if(empty($_SERVER["QUERY_STRING"])) $nowurl = $scriptName;
else $nowurl = $scriptName."?".$_SERVER["QUERY_STRING"];
}
//OsPHP.COM.CN
return $nowurl;
}
?>
//把全角数字转为半角数字
<?
function GetAlabNum($fnum){
$nums = array("０","１","２","３","４","５","６","７","８","９"); //OSPHP.com.CN
$fnums = "0123456789";
for($i=0;$i<=9;$i++) $fnum = str_replace($nums[$i],$fnums[$i],$fnum); //OsPHP.COM.CN
$fnum = ereg_replace("[^0-9.]|^0{1,}","",$fnum);
if($fnum=="") $fnum=0;
return $fnum;
}
?>
//PHP开源代码
//去除HTML标记
<?
function Text2Html($txt){
$txt = str_replace(""," ",$txt);
$txt = str_replace("<","<",$txt); //开源OSPhP.COM.CN
$txt = str_replace(">",">",$txt);
$txt = preg_replace("/{1,}/isU","
rn",$txt);
return $txt; //OSPHP.COm.CN
}
?>
//相对路径转化成绝对路径
<?
function relative_to_absolute($content, $feed_url) {
preg_match('/(http|https|ftp):///', $feed_url, $protocol);
$server_url = preg_replace("/(http|https|ftp|news):///", "", $feed_url); //开源OSPhP.COM.CN
$server_url = preg_replace("//.*/", "", $server_url);
if ($server_url == '') {
return $content;
}
if (isset($protocol)) {
//开源代码OSPhP.COm.CN
$new_content = preg_replace('/href="//', 'href="'.$protocol.$server_url.'/', $content);
$new_content = preg_replace('/src="//', 'src="'.$protocol.$server_url.'/', $new_content);//开源OSPhP.COM.CN
} else {
$new_content = $content;
}
return $new_content;
}
?>
//取得所有链接
<?
function get_all_url($code){
preg_match_all('/<as+href=["|']?([^>"' ]+)["|']?s*[^>]*>([^>]+)</a>/i',$code,$arr);//OSPHP.COm.CN
return array('name'=>$arr,'url'=>$arr);
}
?>
//HTML表格的每行转为CSV格式数组
<?
function get_tr_array($table) { //PHP开源代码
$table = preg_replace("'<td[^>]*?>'si",'"',$table);
$table = str_replace("</td>",'",',$table);
$table = str_replace("</tr>","{tr}",$table); //开源代码OSPhP.COm.CN
//去掉 HTML 标记
$table = preg_replace("'<[/!]*?[^<>]*?>'si","",$table);
//去掉空白字符
$table = preg_replace("'()+'","",$table);
//开源代码OSPhP.COm.CN
$table = str_replace(" ","",$table);
$table = str_replace(" ","",$table);
$table = explode(",{tr}",$table);
//开源代码OSPHP.COM.Cn
array_pop($table);
return $table;
}
?>
//将HTML表格的每行每列转为数组，采集表格数据
<?
function get_td_array($table) {
$table = preg_replace("'<table[^>]*?>'si","",$table); //OSPHP.COm.CN
$table = preg_replace("'<tr[^>]*?>'si","",$table);
$table = preg_replace("'<td[^>]*?>'si","",$table);
$table = str_replace("</tr>","{tr}",$table); //开源代码OSPhP.COm.CN
$table = str_replace("</td>","{td}",$table);
//去掉 HTML 标记
$table = preg_replace("'<[/!]*?[^<>]*?>'si","",$table); //OSPHP.COM.Cn开源
//去掉空白字符
$table = preg_replace("'()+'","",$table);
$table = str_replace(" ","",$table);
//开源代码OSPHP.COM.Cn
$table = str_replace(" ","",$table);
$table = explode('{tr}', $table);
array_pop($table); //PHP开源代码
foreach ($table as $key=>$tr) {
$td = explode('{td}', $tr);
array_pop($td);
$td_array[] = $td; //PHP开源代码
}
return $td_array;
}
?>
//返回字符串中的所有单词 $distinct=true 去除重复
<?
function split_en_str($str,$distinct=true) {
preg_match_all('/(+)/',$str,$match); //开源代码OSPHP.COM.Cn
if ($distinct == true) {
$match = array_unique($match);
}
sort($match); //OSPHP.COm.CN
return $match;
}
?>
//打印出为本PHP项目做出贡献的人员的清单
<?
string phpcredits(void)
?>
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