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;
}
?>

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] = $int;
return date("Y-m-d",mktime(0,$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",$dateArr[1],$dateArr[2],$dateArr[0]));
}
?>

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],$dateArr[0]);
}
return false;
}
function check_time($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 && $timeArr[2] <= 59))
return true;
else
return false;
}
return false;
}
function DateDiff($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;
}
?>

方法一：header("Location: index.PHP");
方法二：echo "window.location ="$PHP_SELF";";
方法三：echo "<Meta HTTP-EQUIV="Refresh" CONTENT="0; URL=index.PHP">";
?>

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); $Part=$temp[1];
$temp =explode(")",$browserver);$browserver=$temp[2];
$browserver =preg_replace("/([d.]+)/",$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];
$browserver =preg_replace("/([d.]+)/",$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
?>

function osinfo() {
$os="";
$Agent = $GLOBALS["HTTP_USER_AGENT"];
if (eregi('win',$Agent) && strpos($Agent,'95')) {
$os="Windows 95";
}
elseif (eregi('win 9x','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)) {
$os="IBM OS/2";
}
elseif (eregi('Mac',$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() ;
?>

$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',
'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',
);
?>

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
?>

//$db->rows[$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?"

":"";
//方法二：
$newTag=$db->rows[$i][date]>=date("Y-m-d 00:00:00")?"

":"";
?>

//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);
?>

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;
}
}
?>

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;
}
?>

function turntopage($url="index.PHP",$info = "页面转向中...",$second=2){
print "nn@H_441_403@页面转向中....@H_306_404@n";
print "<Meta http-equiv="refresh" content="$second;url=$url">n";
print "n";
print "nn";
print "print " print "

print " print " print "

页面转向提示信息print " print " print "

print " print " print "

print " print " print " print " print " print " print "

print " print "print "n";
exit;
?>

产生随机字符串函数

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）

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

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

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）

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;
$out="共".$totalpage."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)
$out .= "第一页 ";
if($start>1)
$out.="..<< ";
for($t=$start;$t<=$end;$t++)
{
$out .= ($page==$t) ? "[".$t."] " : "$t ";
}
if($end<$totalpage)
$out.=">>..";
if($page<>$totalpage)
$out .= " 最后页";
return $out;
}
?>

获取新插入数据的ID

代码如下:

MysqL_insert_id();
?>

//获得当前的脚本网址

代码如下:

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;
}
?>

//把全角数字转为半角数字

代码如下:

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; 
} 
?> 

//去除HTML标记

代码如下:

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; 
} 
?> 

//相对路径转化成绝对路径

代码如下:

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;
}
?>

//取得所有链接

代码如下:

function get_all_url($code){ 
preg_match_all('/"' ]+)["|']?s*[^>]*>([^>]+)/i',$code,$arr); 
return array('name'=>$arr[2],'url'=>$arr[1]); 
} 
?> 

//HTML表格的每行转为CSV格式数组

代码如下:

function get_tr_array($table) {
$table = preg_replace("']*?>'si",'"',$table);
$table = str_replace("$table = str_replace("//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);
$table = explode(",{tr}",$table);
array_pop($table);
return $table;
}
?>

//将HTML表格的每行每列转为数组，采集表格数据

代码如下:

function get_td_array($table) { 
$table = preg_replace("']*?>'si",$table); 
$table = preg_replace("']*?>'si",$table); 
$table = preg_replace("']*?>'si","{td}",$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; 
} 
?> 

//返回字符串中的所有单词 $distinct=true 去除重复

代码如下:

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]; 
} 
?> 

//打印出为本PHP项目做出贡献的人员的清单

代码如下:

string PHPcredits(void)
?>

原文链接：https://www.f2er.com/php/29529.html

常用函数