よく使用されるいくつかの関数

函数

这是一些使用频率比较高的函数，有的来自别人的程序......

1.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;
}

2.截取一定长度的字符串

注：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;
}

3.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");
             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);
}

4.创建相应的文件夹

function createdir($dir='')
{
        if (!is_dir($dir))
        {
            $temp = explode('/',$dir);
            $cur_dir = '';
            for($i=0;$i {
$cur_dir .= $temp[$i].'/';
if (!is_dir($cur_dir))
{
@mkdir($cur_dir,0777);
}
}
}
}

5.判断邮箱地址

function checkEmail($inAddress)
{
return (ereg("^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-])+",$inAddress));

}

6.跳转

function gotourl($message='',$url='',$title='')
{

$html ="";
if(!empty($url))
$html .="";
$html .="";
$html .="



" ;
$html .="

";
$html .="< ;td bgcolor='#ffffff'>";
$html .="";
$html . ="";
$html .="";
$html .="< tr class='line_1'>

".$title."

";
$html .="
".$message."

" ;
if (!empty($url))
$html .="系统将在3秒後に返還
如果您的浏览器不可自动返還,请点击[这里]进入";
else
$html .="[返]";
$html .="< ;/td>

";
$html .="";
echo $html;
exit;
}

7.分页（関数数複合使用）

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"。 $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($page<>1)
$out .= " 第一页 ";
if($start>1)
$out.="< a href='?page=".$prestart."' title=上一页>...<< ";
for($t=$start;$t<=$end; $t++)
{
$out .= ($page==$t) ? "[".$t."] " : "$t ";
}
if($end<$totalpage)
$out.=">>..";
if($page<>$totalpage)
$out .= " 最終後页";
return $out;
}

?>