https://exo-l.smtown.com/homeSome 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。