https://exo-l.smtown.com/home Some commonly used php functions

1. Generate random string function
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 $hash;
}
?>
2. Intercept a string of a certain length
Note: This function is valid for GB2312 use
function wordscut($string, $length,$sss=0) {
if (strlen($string) > $length) {
                                                                                                                  
                                                                                                                                                                                                                                                                                    < $length; $i++) {
if(ord($string[$i]) > 127) {
$wordscut .= $string[$i].$string[$i + 1];
$i++ ;
} else {
.= $string[$i];
}
}
return $wordscut.$addstr;
}
return $string;
}
?>
3. Obtain the client IP address
function GetIP(){
  env("HTTP_CLIENT_IP");
                                                                                using getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
                                                     else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR") ), "unknown"))
                         $ip = getenv("REMOTE_ADDR");                                                                                                                                                                                                                                                    mp($_SERVER['REMOTE_ADDR'] , "unknown"))                                                                                                                                                             return($ip);                        
?> = explode('/' . = $temp[$i].'/';
                                                                                                                                
                                                                                                                                                                                                         inAddress)
{
return (ereg("^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-] )+",$inAddress));
}
?>
6.Jump
function gotourl($message='',$url='',$title='')
{
$html ="";
if(!empty($url))
$html .=" $html .="";
$html .="



";
$html .="

";
$html .="

"; $html .="" ; $html .=""; $html .=""; $html .=" ".$title." "; $html .=" ".$message." "; if (!empty($url)) $html .="The system will return in 3 seconds If your browser cannot return automatically, please click [Here]Enter"; else $html .="[]"; $html .="< ;/td>

";
$html .="";
echo $html;
exit;
} 
?>  
7.分页（两个函数配合使用） 
function getpage($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; 
 $out="共".$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; 
} 
?>  

以上就介绍了https://exo-l.smtown.com/home 一些常用的php函数，包括了https://exo-l.smtown.com/home方面的内容，希望对PHP教程有兴趣的朋友有所帮助。