[PHP] Practical functions 2_PHP tutorial

1. Generate a random string function

Copy the code The code is 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;
}

2. Intercept a string of a certain length (this function is valid for GB2312)

Copy code The code is as follows:

function Wordscut($string, $length,$sss=0) {
if(strlen($string) > $length) { sss){
                                                                             = 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. Obtain the client IP address

Copy the code

The code is as follows: function GetIP(){ if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))

$ip = getenv("HTTP_CL IENT_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 = "unknown ";

                                return($ip); 🎜> The code is as follows:


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

5. Paging (two function)

Copy code The code is as follows:

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($linkNum/2))<$totalpage ? ($page+round($linkNum/2)) : $totalpage; 
    $prestart=$start-1; 
    $nextend=$end+1; 
    if($page<>1)  
$out .= "第一页 "; 
    if($start>1) 
$out.="..<< "; 

for($t=$start;$t<=$end;$t++) 
    { 
     $out .= ($page==$t) ? "[".$t."] " : "$t "; 
    } 
if($end<$totalpage) 
$out.=">>.."; 
    if($page<>$totalpage) 
   $out .= " 最后页"; 
   return $out; 
} 

6、获取新插入数据的ID

复制代码 代码如下:

mysql_insert_id(); 
?>

http://www.bkjia.com/PHPjc/318390.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/318390.htmlTechArticle1、产生随机字符串函数 复制代码 代码如下: functionrandom($length){ $hash=@#@#; $chars=@#ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz@#; $max=strl...