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/获得客户端ip地址/
functiongetIP(){
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'];
}
else{
$ip="unknown";
} return($ip);
} /验证IP地址函数/
functioncheckIP($ip){
returnpreg_match((2[0-4]d|25[0-5]|[01]?dd?).){3}(2[0-4]d|25[0-5]|[01]?dd?);
} /用户输入内容过滤函数/
functiongetStr($str){
$tmpstr=trim($str);
$tmpstr=strip_tags($tmpstr);
$tmpstr=htmlspecialchars($tmpstr); /加入字符转义/
$tmpstr=addslashes($tmpstr); return$tmpstr;
} /容量大小计算函数/
functionsizecount($filesize){
if($filesize>=1073741824){
$filesize=round($filesize/1073741824100)/100.'G';
}elseif($filesize>=1048576){
$filesize=round($filesize/1048576100)/100.'M';
}elseif($filesize>=1024){
$filesize=round($filesize/1024100)/100.'K';
}else{
$filesize=$filesize.'bytes';
}
return$filesize;
} /简单防SQL注入函数/
functiongetSQL($feild){
$tmpfeild=mysql_escape_string($feild); return$tmpfeild;
}
/$num必须为英文字符或数字0-9/
functiongetNums($num){
return(ctype_alnum($num));
} /$char必须为英文字符/
functiongetChar($char){
return(ctype_alpha($char));
}
/匹配qq(5-12)位/
functiongetQQ($qq){
returnpreg_match("/^b[0-9]{5,12}b/",$qq);
}
/匹配电子邮件地址/
functiongetEmail($email){
returnstrlen($email)>6&&preg_match("/^w+@(w+.)+[com]|[cn]$/",$email);
//preg_match("/^[w-.]+@[w-.]+(.w+)+$/",$email);
} /生成email连接/
functionemailconv($email,$tolink=1){
$email=str_replace(array('@','.'),array('@',$email);
return$tolink?'<ahref="mailto:'.$email.'">'.$email.'':$email;
} /检查ip是否被允许访问/
functionipaccess($ip,$accesslist){
returnpreg_match("/^(".str_replace(array("rn",''),array('|',preg_quote($accesslist,'/')).")/",$ip);
} /若标题过长，此函数可显示前几个字符，剩余字符用...代替/
functioncutstr($string,$length){
if(strlen($string)>$length){
for($i=0;$i<$length-3;$i++){
/返回字符的序数值*/
$strcut.=ord($string[$i])>127?$string[$i].$string[++$i]:$string[$i];
}
return$strcut.'...';
}else{
return$string;
}
}
（编辑：李大同）
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