PHP常用函数推荐

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;
}

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;
}

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);
}

function createdir($dir='')
{
        if (!is_dir($dir))
        {
            $temp = explode('/',$dir);
            $cur_dir = '';
            for($i=0;$i

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

+(\.[a-zA-Z0-9_-])+",$inAddress));

}

function gotourl($message='',$url='',$title='')
{
 
    $html  ="＜html＞＜head＞";
    if(!empty($url))
     $html .="＜meta http-equiv='refresh' 

content=\"3;url='".$url."'\"＞";
    $html .="＜link href='../templates/style.css'

 type=text/css rel=stylesheet＞";
    $html .="＜/head＞＜body＞＜br＞＜br＞＜br＞＜br＞";
    $html .="＜table cellspacing='0' cellpadding='0' border='1' 

width='450' align='center'＞";
 $html .="＜tr＞＜td bgcolor='#ffffff'＞";
 $html .="＜table border='1' cellspacing='1' 

cellpadding='4' width='100%'＞";
 $html .="＜tr class='m_title'＞";
 $html .="＜td＞".$title."＜/td＞＜/tr＞";
 $html .="＜tr class='line_1'＞＜td align='center' height='60'＞";
 $html .="＜br＞".$message."＜br＞＜br＞";
    if (!empty($url))
     $html .="系统将在3秒后返回＜br＞如果您的浏览器不能自动返回,

请点击[＜a href=".$url." target=_self＞这里＜/a＞]进入";
    else
     $html .="[＜a href='#' onclick='history.go(-1)'＞返回＜/a＞]";
    $html .="＜/td＞＜/tr＞＜/table＞＜/td＞＜/tr＞＜/table＞";
 $html .="＜/body＞＜/html＞";
 echo $html;
 exit;
}

 $totalpage = ceil($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;
 $out="共＜font color='red'＞＜b＞".$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=＞..＜＜＜/a＞ ";
 for($t=$start;$t＜=$end;$t++)
    {
     $out .= ($page==$t) ? "＜font color='red'＞＜b＞[".$t."]＜/b＞

＜/font＞ " : "＜a href='?page=$t&&".$string."'＞$t＜/a＞ ";
    }
 if($end＜$totalpage)
 $out.="＜a href='?page=".$nextend."&&".$string."' title=＞＞＞..＜/a＞";
    if($page＜＞$totalpage)
   $out .= " ＜a href='?page=".$totalpage."&&".$string."' 

title=最后页＞最后页＜/a＞";
   return $out;
}

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