函数
这是一些使用频率比较高的函数,有的来自别人的程序......
1.产生随机字符串函数
function random($length) {
$hash = '';
$chars = 'abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz';
$max = strlen($chars) - 1;
mt_srand((double)microtime() * 1000000);
for($i = 0; $i $hash .= $chars[mt_rand(0, $max)];
}
return $hash;
}
2.截取一定长度的字符串
注:该函数对gb2312使用有效
function wordscut($string, $length ,$sss=0) {
if(strlen($string) > $length) {
if($sss){
$length=$length - 3;
$addstr=' ...';
}
for($i = 0; $i if(ord($string[$i]) > 127) {
$wordscut .= $string[$i].$string[$i + 1];
$i++;
} else {
$wordscut .= $string[$i];
}
}
return $wordscut.$addstr;
}
return $string;
}
3.取得客户端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.创建相应的文件夹
function createdir($dir='')
{
if (!is_dir($dir))
{
$temp = explode('/',$dir);
$cur_dir = '';
for($i=0;$i {
$cur_dir .= $temp[$i].'/';
if (!is_dir($cur_dir))
{
@mkdir($cur_dir,0777);
}
}
}
}
5.判断邮箱地址
function checkemail($inaddress)
{
return (ereg(^([a-za-z0-9_-])+@([a-za-z0-9_-])+(\.[a-za-z0-9_-])+,$inaddress));
}
6.跳转
function gotourl($message='',$url='',$title='')
{
$html =
;
if(!empty($url))
$html .=;
$html .=;
$html .=
;
$html .=;
$html .=;
$html .=;
$html .=;
$html .=.$title.
;
$html .=;
$html .=
.$message.
;
if (!empty($url))
$html .=系统将在3秒后返回
如果您的浏览器不能自动返回,请点击[这里]进入;
else
$html .=[返回];
$html .=
;
$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 $startpos = ($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)) $prestart=$start-1;
$nextend=$end+1;
if($page1)
$out .= 第一页 ;
if($start>1)
$out.=.. ;
for($t=$start;$t {
$out .= ($page==$t) ? [.$t.] : $t ;
}
if($end $out.=>>..;
if($page$totalpage)
$out .= 最后页;
return $out;
}
?>