php上传文件的增强函数
表单中file对象，比如说$_FILES['doc']，$path为保存的路径，$type为限制上传的类型（他是一个数组，比如说限制上传doc和docx和格式，那这个参数可以填array(“doc”,”.docx”)，而且扩展名前有无”.”不作要求）。
<div class="codetitle"><a style="CURSOR: pointer" data="14913" class="copybut" id="copybut14913" onclick="doCopy('code14913')"> 代码如下:
<div class="codebody" id="code14913">
<?php
function upload($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){
$path .= "/";
}
//为类型加上开头“.”
//将所有类型合成字符串，用"/"连接起来<span id="more-78">
foreach($type as $key=>$typeone){
$type[$key] = $typeone = trim($typeone);
if(strlen(strchr($typeone,".")) != strlen($typeone)){
$type[$key] = ".".$typeone;}
$alltype .= $typeone.‘/‘;
}
$alltype = substr($alltype,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;
}
}
}
?>
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