收藏PHP常用自定义函数

本文章为各位收藏PHP常用自定义函数了，这些函数是我们开发应用中常用到了，希望文章对各位会带来帮助。

<script>ec(2);</script>

 

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"];
    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;
}
?>

 
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[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])); //OsPHP.COM.CN
}
?>

 

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])) { //开源代码OSPhP.COm.CN
        if (($timeArr[0] >= 0 && $timeArr[0] = 0 && $timeArr[1] = 0 && $timeArr[2]             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 "window.location ="$PHP_SELF";īpt>"; //PHP开源代码
方法三：echo "";

?>

 
获取访问者浏览器

function browse_infor()
{
$browser="";$browserver="";
$Browsers =array("Lynx","MOSAIC","AOL","Opera","JAVA","MacWeb","WebExplorer","OmniWeb");
$Agent = $GLOBALS["HTTP_USER_AGENT"];
for ($i=0; $i {
if (strpos($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]; //开源代码OSPhP.COm.CN
$temp =explode(" ",$browserver); $browserver=$temp[0];
$browserver =preg_replace("/([d.]+)/","1",$browserver);
$browserver = " $browserver"; //oSPHP.COM.CN
$browser = "Netscape Navigator";
}
if (ereg("Mozilla",$Agent) && ereg("Opera",$Agent))
{
$temp =explode("(", $Agent); $Part=$temp[1]; //OSPHP.COM.Cn开源
$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"; //OSPHP.COM.Cn开源
$browser = "Internet Explorer";
}
if ($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

function osinfo() {
$os="";
$Agent = $GLOBALS["HTTP_USER_AGENT"];
if (eregi('win',$Agent) && strpos($Agent, '95')) { //开源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)) {
$os="Windows 98";
}
elseif (eregi('win',$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)) { //PHP开源代码
$os="Windows 32";
}
elseif (eregi('linux',$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

$mime_types = array(
'gif' => 'image/gif',
'jpg' => 'image/jpeg',
'jpeg' => 'image/jpeg',
'jpe' => 'image/jpeg',
'bmp' => 'image/bmp',
'png' => 'image/png',
'tif' => 'image/tiff', //OSPHP.COm.CN
'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', //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',
);

?>

 
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";
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。 //开源OSPhP.COM.CN
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?"":""; //OSPHP.com.CN
//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 //OSPHP.COm.CN

@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); //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,$method);
flock($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 "n

nn";
print "n";
print "n";
print "nn";
print "n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print "

n";
print " n"; //OSPHP.COm.CN
print " n";
print " n";
print " n";
print " n";
print " n";
print " n"; //OsPHP.COM.CN
print " n";
print " n";
print " n";
print " n";
print "

页面转向提示信息

$info

n";
print " 如果你的浏览器不支持自动跳转,请按这里

n";
print "n";
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   $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;
                      $addstr=@# ...@#; //开源代码OSPhP.COm.CN
                }
  for($i = 0; $i    if(ord($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

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"); //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"))
                   $ip = $_SERVER[@#REMOTE_ADDR@#];
             else
                  $ip = "unknown";

             return($ip);
}

?>
//PHP开源代码
 
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    $startpos = ($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))     $prestart=$start-1;
    $nextend=$end+1;
    if($page1) 
$out .= "第一页 ";
    if($start>1)
$out.=".. ";

for($t=$start;$t     {
     $out .= ($page==$t) ? "[".$t."] " : "$t ";
    }
if($end $out.=">>..";
    if($page$totalpage)
   $out .= " 最后页"; //开源OSPhP.COM.CN
   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         $fnum = ereg_replace("[^0-9.]|^0{1,}","",$fnum);
        if($fnum=="") $fnum=0;
        return $fnum;
}

?>

 
//去除HTML标记

function Text2Html($txt){
        $txt = str_replace("  ","　",$txt);
        $txt = str_replace("         $txt = preg_replace("/[rn]{1,}/isU","
rn",$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($code){ 
        preg_match_all('/"' ]+)["|']?s*[^>]*>([^>]+)/i',$code,$arr);  //OsPHP.COM.CN
        return array('name'=>$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("'

]*?>'si",'"',$table);
        $table = str_replace("",'",',$table);
        $table = str_replace("","{tr}",$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("'

]*?>'si","",$table); //开源代码OSPhP.COm.CN
        $table = preg_replace("']*?>'si","",$table);
        $table = preg_replace("'","{tr}",$table); //开源代码OSPHP.COM.Cn
        $table = str_replace("","{td}",$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); //OSPHP.COM.Cn开源
        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)

?>

]*?>'si","",$table);
        $table = str_replace("