PHP愛好者來看:常用PHP代碼

來源:互聯網
上載者:User

這是一些使用頻率比較高的函數......

1.產生隨機字串函數

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.截取一定長度的字串

註:該函數對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.取得用戶端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.建立相應的檔案夾

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

5.判斷郵箱地址

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

6.跳轉

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))
     $html .="系統將在3秒後返回<br>如果您的瀏覽器不能自動返回,請點擊[<a href=".$url." target=_self>這裡</a>]進入";
    else
     $html .="[<a href=@##@# onclick=@#history.go(-1)@#>返回</a>]";
    $html .="</td></tr></table></td></tr></table>";
 $html .="</body></html>";
 echo $html;
 exit;
}

7.分頁(兩個函數配合使用)

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<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>頁  ";
    $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=第一頁>第一頁</a> ";
    if($start>1)
 $out.="<a href=@#?page=".$prestart."@# title=上一頁>..<<</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."&&".$string."@# title=下一頁>>>..</a>";
    if($page<>$totalpage)
   $out .= " <a href=@#?page=".$totalpage."&&".$string."@# title=最後頁>最後頁</a>";
   return $out;
}

8.擷取新插入資料的ID

<?
mysql_insert_id();
?>



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