收藏的PHP常用函数 推荐收藏保存

　　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;
$out=共or=@#red@#><b>.$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(/(httphttpsftp):///, $feed_url, $protocol);
$server_url = preg_replace(/(httphttpsftpnews):///, , $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)
?>