Collection of common PHP functions-PHP Tutorial-php.cn

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Source: php source code network - Open Source Programs (Open Source)

Content:
function GetIP() { //Get 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");
el se if (getenv("REMOTE_ADDR"))
$ip = getenv("REMOTE_ADDR");
else
$ip = "Unknown";
return $ip;
}
?>

Detailed source reference: http:// /www.jb51.net/article/22199.htm

function DateAdd($date, $int, $unit = "d") { //Increase of time (can also be improved to hours, minutes and seconds) You can increase it and make it up when you have time)
$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) { //Calculate the day of the week for the given date
$dateArr = explode("-", $date);
return date("w", mktime(0,0,0,$dateArr[1] ,$dateArr[2],$dateArr[0]));
}
?>
Detailed source reference: http://www.jb51.net/article/22199.htm

function check_date( $date) { //Check whether the date is a legal date
$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) { //Check whether the time is Legal time
$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;
}
Detailed source reference: http://www.jb51.net/article /22199.htm

function DateDiff($date1, $date2, $unit = "") { //Time comparison function, returns the number of seconds, minutes, hours or days between two dates
switch ($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;
}
?>
Detailed source reference: http://www.jb51.net/article/22199.htm

Method 1: header("Location: index.php");
Method 2: echo "window.location ="$PHP_SELF";";
Method 3: echo "";
?>
Detailed source reference: http://www.jb51.net/article/22199.htm

PHP Redirect
Copy the code as follows:
Method 1: header("Location: index.php");
Method 2: echo "window.location ="$PHP_SELF";< ;/scrīpt>";
Method 3: echo "";
?>

Get the visitor's browser
code As follows:
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
?>
详细出处参考：http://www.jb51.net/article/22199.htm

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() ;
?>

详细出处参考：http://www.jb51.net/article/22199.htm

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',
);
?>

详细出处参考：http://www.jb51.net/article/22199.htm

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
?>

Detailed source reference: http://www.jb51.net/article/22199.htm

Time comparison issue
Give a simple example: For example, a forum uses a new image to mark the posts published on that day.
Method 1:
Copy the code as follows:
//$db->rows[$i][date] is the datetime field value in the database.
$today=time();
$theDay= date("Y-m-d H:i:s",$today-24*3600);
$newTag=$db->rows[$i][date]>=$theDay?"":"";
//Method 2:
$newTag=$db->rows[$i][date]>=date("Y-m-d 00:00:00 ")?"":"";
?>

Copy the code as follows:
//Extract the variables submitted by the page and browser, the function Equivalent to opening global variables in PHP.INI
@extract($_SERVER, EXTR_SKIP);
@extract($_SESSION, EXTR_SKIP);
@extract($_POST, EXTR_SKIP);
@extract($_FILES , EXTR_SKIP);
@extract($_GET, EXTR_SKIP);
@extract($_ENV, EXTR_SKIP);
?>

Copy the code as follows:
//Read file function
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 $file_data; writetofile($file_name,$data,$method="w") {
$filenum=fopen($file_name,$method);
flock($filenum,LOCK_EX);
$file_data=fwrite($filenum,$data) ;
fclose($filenum);
return $file_data;
}
?>

Copy the code as follows:
//Quick page redirection
function turntopage($url="index.php",$ info = "The page is redirecting...",$second=2){
print "nnThe page is redirecting....n";
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 " print "

n";
print " n ";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " < ;tr>n";
print " n";
print " n";
print " n";
print "

Page redirection prompt message

$info

n";
print " If your browser does not support automatic jump, please click here

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

Generate a random string function
Copy the code as follows:
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;
}
?>

Intercept a string of a certain length (this function is valid for GB2312)
Copy the code as follows:
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;
}
?>

Get the client IP address
The code is as follows:
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);
}
?>

Judge the email address
The code is as follows:
function checkEmail($inAddress)
{
return (ereg("^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+ ",$inAddress));
}
?> ,$totalpage,$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;
$out="Total".$totalpage."page";
$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)
$out .= "First page ";
if($start>1)
$out.="..<< ";
for($t=$start;$t<=$end;$t++)
{
$out .= ($page==$t) ? "[".$t."]< ;/b> " : "$t ";
}
if($end< ;$totalpage)
$out.=">>..< /a>";
if($page<>$totalpage)
$out .= " Last page";
return $out;
}
?>

Get the ID of newly inserted data
Copy the code as follows:
mysql_insert_id();
?>
The code is as follows:
//Get the current script URL
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;
}
?>

The code is as follows:
//Convert full-width numbers to half-width numbers
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 $fnum;
}
?>
The code is as follows:
//Remove HTML tags
< ?
function Text2Html($txt){
$txt = str_replace(" ","　",$txt);
$txt = str_replace("<","<",$txt);
$txt = str_replace (">",">",$txt);
$txt = preg_replace("/[rn]{1,}/isU","
rn",$txt);
return $txt;
}
?>

The code is as follows:
//Convert relative path to absolute path
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;
}
?>

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

Copy the code The code is as follows:
//Convert each row of the HTML table to a CSV format array
function get_tr_array($table) {
$table = preg_replace("']*?>'si",'"',$table);
$table = str_replace("",'",', $table);
$table = str_replace("","{tr}",$table);
//Remove HTML tag
$table = preg_replace("'<[/!]*? [^<>]*?>'si","",$table);
//Remove whitespace characters
$table = preg_replace("'([rn])[s]+'","" ,$table);
$table = str_replace(" ","",$table);
$table = str_replace(" ","",$table);
$table = explode(",{tr}", $table);
array_pop($table);
return $table;
}
?>

Copy the code as follows:
//Convert each row and column of the HTML table into an array and collect table data
< ?
function get_td_array($table) {
$table = preg_replace("']*?>'si","",$table);
$table = preg_replace("'< tr[^>]*?>'si","",$table);
$table = preg_replace("']*?>'si","",$table );
$table = str_replace("","{tr}",$table);
$table = str_replace("","{td}",$table);
//Remove HTML tags
$table = preg_replace("'<[/!]*?[^<>]*?>'si","",$table);
//Remove blank characters
$table = preg_replace("'([rn])[s]+'","",$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)
?>

//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);
$txt = str_replace("<","<",$txt);
$txt = str_replace(">",">",$txt);
        $txt = preg_replace("/[\r\n]{1,}/isU","
\r\n",$txt);
        return $txt;
}

//清除HTML标记
function ClearHtml($str){
        $str = str_replace('<','<',$str);
$str = str_replace('>','>',$str);
        return $str;
}
//相对路径转化成绝对路径
function relative_to_absolute($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 $new_content;
}
//Get all links
function get_all_url($code){
preg_match_all('/"' ]+)[" |']?s*[^>]*>([^>]+)/i',$code,$arr);
                    return array('name'=>$arr [2],'url'=>$arr[1]);
}

//Get the content in the specified tag
function get_tag_data($str, $start, $end){
If ( $ start == '' || $end == '' ){
                                                                                                                                                      return $str[0];
}
//Convert each row of the HTML table to a CSV format array
function get_tr_array($table) {
$table = preg_replace("']*?> 'si",'"',$table);
$table = str_replace("",'",',$table);
$table = str_replace(""," {tr} ", $ table);
// Remove the html mark

$ table = preg_replace (" '& lt; [/!]*? [^& lt; & gt;]*? & gt;' si ", "",$table);
                                                                                                                                                                                                                                                                                 $table ",$table);
        $table = str_replace(" ","",$table);             $table = explode(", {tr}", $table);            array_pop($table);                  return $ table;
}

//Convert each row and column of the HTML table into an array and collect table data
function get_td_array($table) {
;'si","",$table);
$table = preg_replace("']*?>'si","",$table);
$table = preg_replace(" ']*?>'si","",$table);
$table = str_replace("","{tr}",$table);
$ table = str_replace("","{td}",$table);
                                                                                                                      table = str_replace(" );
;array_pop($td);
ct =true) {
          preg_match_all('/([a-zA-Z]+)/',$str,$match);                                        [1]);
                                                              sort($match[1]); $ fd=fopen($file_name,r);
while($bufline=fgets($fd, 4096)){
$buf.=$bufline;
}
fclose($fd);
return $buf;
}
?> fopen($file_name,$method);
flock($filenum,LOCK_EX);
$file_data=fwrite($filenum,$data);
fclose($filenum);
return $file_data;
}
?>

Static page generation function

//Static page generation function
function phptohtm($filefrom,$fileto,$u2u=1){
if($u2u==1){
$data=PHP_Read($ filefrom);
}else{
$data=$filefrom;
}
PHP_Write($fileto,$data);
return true;
}
?>

Specify condition information quantity retrieval function

//Specify condition information quantity retrieval function
function rec_exist($table,$where){
$query="select count(*) as num from $table ".$where;
$result=mysql_query ($query) or die(nerror(1));
$rowcount=mysql_fetch_array($result);
$num=$rowcount["num"];
if ($num==0){
return false;
}
Return $num;
}
?>

Directory deletion function

//Directory deletion function
function del_DIR($directory){
$mydir=dir($directory) ;
while($file=$mydir->read()){
if((is_dir("$directory/$file")) AND ($file!=".") AND ($file!=".." )){
del_DIR("$directory/$file");
}else{
if(($file!=".") AND ($file!="..")){
unlink("$directory /$file");
//echo "unlink $directory/$file ok ";
}
}
}

$mydir->close();
rmdir($directory);
//echo " rmdir $directory ok ";
}
?>

Directory name legality detection function

// Directory name legality detection
function isen($str){
$ret="";
for ($i=0;$i $p=ord(substr($str,$i,1));
if(($p<48 & $p!=45 & $p!=46) || ($ p>57 & $p<65) || ($p>90 & $p<97 & $p!=95) || $p>122){
nerror("Does not meet the specification! ");
}
$ret.=chr($p);
}
return $ret;
}
?>

paging function

   //分页函式
   function splitlist($HALT,$LRLIST,$ECHOCNT,$paper,$table,$where,$page_id,$userid){
   global $splitstr,$sumcnt;
   if($paper=="" || $sumcnt==""){
   $query = "select count(*) as num from $table $where";
   $result = mysql_query($query);
   $row = mysql_fetch_array($result);
   $sumcnt=$row["num"];
   if($sumcnt==0){
   nerror("该版内还没有选择发布新闻！");
    }
   $paper=1;
    }

   $sumpaper=($sumcnt-$sumcnt%$ECHOCNT)/$ECHOCNT;
   if(($sumcnt%$ECHOCNT)!=0) $sumpaper+=1;
   if($sumpaper==1 && $HALT==0) return($where);
   $enwhere=base64_encode(base64_encode($where));
   if(($LRLIST*2+1) < $sumpaper){
   if(($paper-$LRLIST) < 2){
   $tract=1;
   $sub=$LRLIST*2+1;
    }else if(($paper+$LRLIST) >= $sumpaper){
   $tract=$sumpaper-($LRLIST*2);
   $sub=$sumpaper;
    }else{
   $tract=$paper-$LRLIST;
   $sub=$paper+$LRLIST;
    }
    }else{
   $tract=1;
   $sub=$sumpaper;
    }
   $uppaper=$paper-1;
   $downpaper=$paper+1;
   $startcnt=($paper-1)*$ECHOCNT;
   $where.=" limit ${ startcnt },${ ECHOCNT }";

   if($tract > 1) { $splitstr="【 << "; }
   else $splitstr="【 << ";
   for($i=$tract;$i<=$sub;$i++){
   if ($i!=$paper) $splitstr.="".$i." ";
   else $splitstr.="".$i." ";
    }
   if ($sub!=$sumpaper) $splitstr.=">> 】";
   else $splitstr.=">> 】";
   return($where);
    }
   ?>

关于分页函式的使用说明
      /*
   #### 检索分页函式 ####
   Int $HALT - 检索结果仅分1页时是否(1/0)显示页码条
   Int $LRLIST - (页码条显示页码数-1)/2
   Int $ECHOCNT - 检索时每页显示记录的数量
   Int $paper - 页数，预提取：$paper=$HTTP_GET_VARS[paper];
   Varchar $table - 数据表名,预附值：$table="db.table";
   Varchar $where - 检索条件，预附值：$where="where field='value'";

   Varchar $enwhere - 将原$where进行两次base64_encode()编码后以GET的方式提交
   Varchar $splitstr - 页码条输出字串，执行函式后在相应的位置执行 echo $splitstr;

   函式调用前需获取变量 -
   $paper=$HTTP_GET_VARS[paper];
   $sumcnt=$HTTP_GET_VARS[sumcnt];
   $enwhere=$HTTP_GET_VARS[enwhere];

   Return (Varchar $where) - 分页后检索语句的检索条件
   注意：本函式需调用出错处理函式 nerror($error);
   */

图片文件上传函式

//图片文件上传函式
   function upload_img($UploadFile,$UploadFile_name,$UploadFile_size,$UploadPath,$max_size=64){

   //$TimeLimit=60; //设置超时限制时间缺省时间为 30秒设置为0时为不限时
   //set_time_limit($TimeLimit);
   if(($UploadFile!= "none" )&&($UploadFile != "" )){
   $FileName=$UploadPath.$UploadFile_name;
   if($UploadFile_size <1024){
   $FileSize="(string)$UploadFile_size" . "字节";
    }elseif($UploadFile_size <(1024 * $max_size)){

   $FileSize=number_format((double)($UploadFile_size / 1024), 1) . " KB";
    }else{
nerror("File exceeds size limit!");
}
//{
//$FileSize="number_format((double)($UploadFile_size" / (1024 * 1024)), 1) . " MB";
/ / }
if(!file_exists($FileName)){
if(copy($UploadFile,$FileName)){
return "$UploadFile_name ($FileSize)";
}else{
nerror("File $UploadFile_name failed to upload ! ");
}
unlink($UploadFile);
}else{
nerror("File $UploadFile_name already exists!");
}
//set_time_limit(30); //Restore the default timeout setting
}
}

How to determine the legitimacy of an ip address
if(!strcmp(long2ip(sprintf("%u",ip2long($ip))),$ip)) echo "is ipn";
----

Email regularity judgment
eregi("^[_.0-9a-zA-Z-]+@([0-9a-zA-Z][0-9a-zA-Z_-]+.)+[ a-zA-Z]$", $email);

Example of checking whether the ip address and mask are legal

$ip = '192.168.0.84';
$mask = '255.255.255.0' ;
$network = '192.168.0';
$ip = ip2long($ip);
$mask = ip2long($mask);
$network = ip2long($network);

if( ($ip & $ mask) == $network) echo "valid ip and maskn";
?>

----

How to set the file download header output

header("Content- type: application/x-download");
header("Content-Disposition: attachment; filename=$file_download_name;");
header("Accept-Ranges: bytes");
header("Content-Length: $download_size ");
echo 'xxx'

Use header to output ftp download method, and support breakpoint resume download
An example:

header('Pragma: public');
header('Cache-Control : private');
header('Cache-Control: no-cache, must-revalidate');
header('Accept-Ranges: bytes');
header('Connection: close');
header("Content -Type: audio/mpeg");
header("Location:ftp://download:1bk3l4s3k9s2@232.2.22.22/2222/web technology development knowledge base/cn_web.rmvb");

Regular Match Chinese
ereg("^[".chr(0xa1)."-".chr(0xff)."]+$", $str);

Batch replace hyperlinks in text

< ;?php
function urlParse($str = ''){
if ('' == $str) return $str;
$types = array("http", "ftp", "https");

$ replace = << ''.htmlentities('1').htmlentities('2 ').''
EOPHP;

$ret = $str;

while(list(,$type) = each($types)){
$ret = preg_replace("| ($type://)([^s]*)|ie ", $replace, $ret);
}

return $ret;
}
?>