下面介绍PHP把全角数字转为半角数字：

　　//把全角数字转为半角数字

function GetAlabNum($fnum){
$nums = array("０","１","２","３","４","５","６","７","８","９");
//OSPHP.com.CN
$fnums = "0123456789";
for($i=0;$i<=9;$i++) $fnum = str_replace($nums[$i],$fnums[$i],$fnum); //OsPHP.COM.CN
$fnum = ereg_replace("[^0-9.]|^0{1,}","",$fnum);
if($fnum=="") $fnum=0;
return $fnum;
}
?>