php函数笔记
//utf-8中文截取，单字节截取模式function cn_substr_utf8($str, $length, $start=0)
{
if(strlen($str) < $start+1)
{
return '';
}
preg_match_all("/./su", $str, $ar);
$str = '';
$tstr = '';
//为了兼容mysql4.1以下版本,与数据库varchar一致,这里使用按字节截取
for($i=0; isset($ar[$i]); $i++)
{
if(strlen($tstr) < $start)
{
$tstr .= $ar[$i];
}
else
{
if(strlen($str) < $length + strlen($ar[$i]) )
{
$str .= $ar[$i];
}
else
{
break;
}
}
}
return $str;
}
//取得IP
function egetip(){
if(getenv('HTTP_CLIENT_IP')&&strcasecmp(getenv('HTTP_CLIENT_IP'),'unknown'))
{
$ip=getenv('HTTP_CLIENT_IP');
}
elseif(getenv('HTTP_X_FORWARDED_FOR')&&strcasecmp(getenv('HTTP_X_FORWARDED_FOR'),'unknown'))
{
$ip=getenv('HTTP_X_FORWARDED_FOR');
}
elseif(getenv('REMOTE_ADDR')&&strcasecmp(getenv('REMOTE_ADDR'),'unknown'))
{
$ip=getenv('REMOTE_ADDR');
}
elseif(isset($_SERVER['REMOTE_ADDR'])&&$_SERVER['REMOTE_ADDR']&&strcasecmp($_SERVER['REMOTE_ADDR'],'unknown'))
{
$ip=$_SERVER['REMOTE_ADDR'];
}
return preg_replace("/^([\d\.]+).*/", "\\1",RepPostVar($ip));
}
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