收藏PHP常用函数

最近研究PHP，收藏一下。
出处：php源码网-开源程序大全(Open Source)


内容：
<?
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;
}
?>

详细出处参考：http://www.gxlcms.com/article/22199.htm


<?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]));
}
?>
详细出处参考：http://www.gxlcms.com/article/22199.htm

<?
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;
}
详细出处参考：http://www.gxlcms.com/article/22199.htm


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;
}
?>
详细出处参考：http://www.gxlcms.com/article/22199.htm


<?
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">";
?>
详细出处参考：http://www.gxlcms.com/article/22199.htm

PHP重定向
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 
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 
?> 
详细出处参考：http://www.gxlcms.com/article/22199.htm 

获取访问者操作系统 
 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.gxlcms.com/article/22199.htm 

文件格式类 
 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.gxlcms.com/article/22199.htm 

php生成excel文档 
 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 
?> 

详细出处参考：http://www.gxlcms.com/article/22199.htm 

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： 
 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'>":""; 
?> 

 代码如下:

//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); 
?> 

 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; 
} 
} 
?> 

 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; 
} 
?> 

 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 
 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; 
$out="共<font ".$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 
 代码如下:

<? 
mysql_insert_id(); 
?> 
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; 
} 
?> 

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; 
} 
?> 
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; 
} 
?> 

代码如下:

//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; 
} 
?> 

 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]); 
} 
?> 

 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; 
} 
?> 

 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; 
} 
?> 

 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]; 
} 
?> 

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


//清除HTML标记 
function ClearHtml($str){ 
        $str = str_replace('<','&lt;',$str); 
        $str = str_replace('>','&gt;',$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 $new_content; 
} 
//取得所有链接 
function get_all_url($code){ 
        preg_match_all('/<a\s+href=["|\']?([^>"\' ]+)["|\']?\s*[^>]*>([^>]+)<\/a>/i',$code,$arr); 
        return array('name'=>$arr[2],'url'=>$arr[1]); 
} 




//获取指定标记中的内容 
function get_tag_data($str, $start, $end){ 
        if ( $start == '' || $end == '' ){ 
               return; 
        } 
        $str = explode($start, $str); 
        $str = explode($end, $str[1]); 
        return $str[0]; 
} 
//HTML表格的每行转为CSV格式数组 
function get_tr_array($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 
        $table = preg_replace("'([\r\n])[\s]+'","",$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 
        $table = preg_replace("'([\r\n])[\s]+'","",$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]; 
} 





   //文件读取函式 
   function PHP_Read($file_name) { 
   $fd=fopen($file_name,r); 
   while($bufline=fgets($fd, 4096)){ 
   $buf.=$bufline; 
    } 
   fclose($fd); 
   return $buf; 
    } 
   ?> 






文件写入函式 




    //文件写入函式 
   function PHP_Write($file_name,$data,$method="w") { 
   $filenum=@fopen($file_name,$method); 
   flock($filenum,LOCK_EX); 
   $file_data=fwrite($filenum,$data); 
   fclose($filenum); 
   return $file_data; 
    } 
   ?> 


静态页面生成函式 


   //静态页面生成函式 
   function phptohtm($filefrom,$fileto,$u2u=1){ 
   if($u2u==1){ 
   $data=PHP_Read($filefrom); 
    }else{ 
   $data=$filefrom; 
    } 
   PHP_Write($fileto,$data); 
   return true; 
    } 
   ?> 






指定条件信息数量检索函式 




    //指定条件信息数量检索函式 
   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; 
    } 
   ?> 





目录删除函式  


   //目录删除函式 
   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 "; 
    } 
?> 



目录名称合法性检测函式 


   //目录名称合法性检测 
   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("不符合规范！"); 
    } 
   $ret.=chr($p); 
    } 
   return $ret; 
    } 
   ?> 



分页函式  


   //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("文件超过限制大小！"); 
    } 
   //{ 
   //$FileSize="number_format((double)($UploadFile_size" / (1024 * 1024)), 1) . " MB"; 
   // } 
   if(!file_exists($FileName)){ 
   if(copy($UploadFile,$FileName)){ 
   return "$UploadFile_name ($FileSize)"; 
    }else{ 
   nerror("文件 $UploadFile_name 上载失败！"); 
    } 
   unlink($UploadFile); 
    }else{ 
   nerror("文件 $UploadFile_name 已经存在！"); 
    } 
   //set_time_limit(30); //恢复缺省超时设置 
    } 
    } 




  如何判断ip地址合法性 
if(!strcmp(long2ip(sprintf("%u",ip2long($ip))),$ip)) echo "is ipn"; 
---- 

email的正则判断 
eregi("^[_.0-9a-zA-Z-]+@([0-9a-zA-Z][0-9a-zA-Z_-]+.)+[a-zA-Z]$", $email); 



检测ip地址和mask是否合法的例子 





$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"; 
?>  



---- 



文件下载头部
输出如何设定 





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' 



用header
输出ftp下载方式,并且支持断点续传 
一个例子: 




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技术开发知识库/cn_web.rmvb"); 







正则匹配中文 
ereg("^[".chr(0xa1)."-".chr(0xff)."]+$", $str); 

批量替换文本里面的超级链接 





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

$replace = <<<EOPHP 
  '<a href="'.htmlentities('\1').htmlentities('\2').'">'.htmlentities('\1').htmlentities('\2').'</a>' 
EOPHP; 




$ret = $str; 

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



return $ret; 
} 
?>