标题：经典收藏PHP常用函数
出处：沧海一粟
时间：Wed, 22 Apr 2009 09:09:53 +0000
作者：jed
地址：http://www.dzhope.com/post/590/

内容：


<?
function GetIP() { //获取IP zuolo:由于防火墙的原因 REMOTE_ADDR 就是服务器外网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(0,0,0, $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]));
}
?>







<?
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;
}

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


<?
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
function browse_infor()
{
    $browser="";$browserver="";
    $Browsers =array("Lynx","MOSAIC","AOL","Opera","JAVA","MacWeb","WebExplorer","OmniWeb");
    $Agent = $_SERVER["HTTP_USER_AGENT"];
    for ($i=0; $i<=7; $i++)    {
        if (strpos($Agent,$Browsers[$i]))    {
        $browser = $Browsers[$i];
        $browserver ="";
        }
    }
//    if (ereg("Mozilla",$Agent) && !ereg("MSIE",$Agent))    { bug：会把谷歌浏览器Chrome误认为Netscape Navigator
//        $temp =explode("(", $Agent); $Part=$temp[0];
//        $temp =explode("/", $Part); $browserver=$temp[1];
//        $temp =explode(" ",$browserver); $browserver=$temp[0];
//        $browserver =preg_replace("/([d.]+)/","1",$browserver);
//        $browser = "Netscape Navigator";
//    }
    if (ereg("Mozilla",$Agent) && ereg("Chrome",$Agent))    {
        $browserver=substr($Agent,strripos($Agent, "Chrome"));
        $browserver=substr($browserver,7,(strripos($browserver," ")-7));
        $browser = "Google Chrome";
    }
    if (ereg("Mozilla",$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);
        $browser = "Opera";
    }
    if (ereg("Mozilla",$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); bug：在IE7中会把版本号7.0转为710
        $browser = "Internet Explorer";
    }
    if ($browser!="")    {
        $browseinfo = "$browser $browserver";
    }
    else    {
        $browseinfo = "Unknown";
    }
    return $browseinfo;
}


//获取访问者操作系统
function osinfo() {
    $os="";
    $Agent = $_SERVER["HTTP_USER_AGENT"];
    if (eregi('win',$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 5.1',$Agent)) {
        $os="Windows XP";
    }
    elseif (eregi('win',$Agent) && eregi('nt 6.0',$Agent)) {
        $os="Windows Vista";
    }
    elseif (eregi('win',$Agent) && eregi('nt',$Agent)) {
        $os="Windows NT";
    }
    elseif (eregi('win',$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;
}







文件格式类


<?
$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',
);

?>

[code]



php生成excel文档

[code]
<?
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：

<?
//$db->rows[$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'>":"";

?>






//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);

?>






//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;
}
}

?>






//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;
}

?>






//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


<?
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）

<?
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 //zuolo 由于防火墙的原因 REMOTE_ADDR 就是服务器外网IP


<?
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


<?
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）


<?
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


<?
mysql_insert_id();
?>






//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;
}

?>






//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;
}

?>






//去除HTML标记


<?
function Text2Html($txt){
        $txt = str_replace(" ","　",$txt);
        $txt = str_replace("<","&lt;",$txt);
        $txt = str_replace(">","&gt;",$txt);
        $txt = preg_replace("/[rn]{1,}/isU","
rn",$txt);
        return $txt;
}

?>






//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; 
} 

?>






//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]); 
}

?>






//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;
}

?>







//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;
}

?>






//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];
}
?>





//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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