php上传文件的增强函数

<?php
function upload($file,$path,$type){
$state = array();
$state[error] = "true";
$alltype = ""; // 所有可以上传的类型，用"/"连接起来
$path = trim($path);
//为$path末尾加上"/"
if(strlen(strrchr($path,‘/‘)) <= 1){
$path .= "/";
}
//为类型加上开头“.”
//将所有类型合成字符串，用"/"连接起来<span id="more-78"></span>
foreach($type as $key=>$typeone){
$type[$key] = $typeone = trim($typeone);
if(strlen(strchr($typeone,".")) != strlen($typeone)){
$type[$key] = ".".$typeone;}
$alltype .= $typeone.‘/‘;
}
$alltype = substr($alltype,0,strlen($alltype)-1); //去掉最后的“/”
if(empty($file[name])){
$state[error] = "没有上传{$alltype}类型文件！";
$state[errorid] = 8;
return $state;
} else {
if (!$file[error]) {
$state[name] = $file[name];
$state[type] = strrchr($state[name],‘.‘);
if(in_array($state[type],$type)){
$time = date("U");
$state[upname] = $time.rand(1000,9999).$state[type]; //文件命名
if(copy($file[tmp_name],$path.$state[upname])){
$state[time] = date("U"); //上传的时间
$state[error] = false;
return $state;
} else {
switch($file(‘error‘)){
case 1: $state[error] = $state[name]."上传失败，文件大小超出了服务器的空间大小！";$state[errorid] = 1;return $state;
case 2: $state[error] = $state[name]."上传失败，要上传的文件大小超出浏览器限制！";$state[errorid] = 2;return $state;
case 3: $state[error] = $state[name]."上传失败，文件仅部分被上传！";$state[errorid] = 3;return $state;
case 4: $state[error] = $state[name]."上传失败，没有找到要上传的文件！";$state[errorid] = 4;return $state;
case 5: $state[error] = $state[name]."上传失败，服务器临时文件夹丢失！";$state[errorid] = 5;return $state;
case 6: $state[error] = $state[name]."上传失败，文件写入到临时文件夹出错！";$state[errorid] = 6;return $state;
default: $state[error] = $state[name]."上传失败，位置错误！";$state[errorid] = 10;return $state;
}
}
} else {
$state[error] = $state[name]."上传失败！不符合所要上传的文件类型！({$alltype})";
$state[errorid] = 10;
return $state;
}
}
}
?>