PHP文件上传设置和处理(多文件)

<?php
header("Content-Type:text/html;charset=utf-8");
/*
//原来$_FILES的内容
Array
(
[pic] => Array
(
[name] => Array
(
[0] => 175_2426_3ecb275c994a192.jpg
[1] => 195_4074_831a070561e20a0.jpg
[2] => 46348.jpg
[3] => 4e4b68e5a9334.jpg
)

[type] => Array
(
[0] => image/jpeg
[1] => image/jpeg
[2] => image/jpeg
[3] => image/jpeg
)

[tmp_name] => Array
(
[0] => C:\wamp\tmp\php30.tmp
[1] => C:\wamp\tmp\php31.tmp
[2] => C:\wamp\tmp\php32.tmp
[3] => C:\wamp\tmp\php33.tmp
)

[error] => Array
(
[0] => 0
[1] => 0
[2] => 0
[3] => 0
)

[size] => Array
(
[0] => 8374
[1] => 43274
[2] => 4052
[3] => 108521
)

)

//要转换成如下的格式
[pic] = array(
[0] => Array
(
[name] => 195_4074_831a070561e20a0.jpg
[type] => image/jpeg
[tmp_name] => C:\wamp\tmp\php45.tmp
[error] => 0
[size] => 43274
)

[1] => Array
(
[name] => 195_4074_831a070561e20a0.jpg
[type] => image/jpeg
[tmp_name] => C:\wamp\tmp\php45.tmp
[error] => 0
[size] => 43274
)

[2] => Array
(
[name] => 195_4074_831a070561e20a0.jpg
[type] => image/jpeg
[tmp_name] => C:\wamp\tmp\php45.tmp
[error] => 0
[size] => 43274
)

[3] => Array
(
[name] => 195_4074_831a070561e20a0.jpg
[type] => image/jpeg
[tmp_name] => C:\wamp\tmp\php45.tmp
[error] => 0
[size] => 43274
)
)
*/

$num = count($_FILES['pic']['name']);//长度4

for($i=0; $i<$num; $i++) {

//第一步：判断错误
if($_FILES['pic']['error'][$i] > 0) {
switch($_FILES['pic']['error'][$i]) {
case 1:
echo "表示上传文件的大小超出了约定值。文件大小的最大值是在PHP配置文件中指定的，该指令是：upload_max_filesize<br>";
break;
case 2:
echo "表示上传文件大小超出了HTML表单隐藏域属性的MAX＿FILE＿SIZE元素所指定的最大值1M<br>";
break;
case 3:
echo "表示文件只被部分上传<br>";
break;
case 4:
echo "表示没有上传任何文件<br>";
break;
default:
echo "末知错误<br>";
}
continue;
}

//第二步：判断类型
$arr = explode(".", basename($_FILES['pic']['name'][$i]));
$hz = array_pop($arr);

$allowtype =array("gif", "png", "jpg", "jpeg");

if(!in_array($hz, $allowtype)) {
echo "上传的类型不合法";
continue;
}

//第三步：判断大小
$maxsize= 1000000;
if($_FILES['pic']['size'][$i] > $maxsize) {
echo "上传的文件超过了，{$maxsize}字节!";
continue;
}

//第四步，上传后的文件名一定要设置
$tmpfile = $_FILES['pic']['tmp_name'][$i];
$srcname = "./uploads/".date("YmdHis").rand(100, 999).".".$hz;

//将临时目录下的上传的文件，复制到我指定目录下，指定的名子就可以完成上传
if( move_uploaded_file($tmpfile, $srcname) ) {
echo "上传 {$_FILES['pic']['name'][$i]} 成功!<br>";
}else{
echo "上传失败!<br>";
}}

<form action="upload.php" method="post" enctype="multipart/form-data" >
name: <input type="text" name="username" value="" /><br>
<input type="hidden" name="MAX_FILE_SIZE" value="1000000" />
up pic: <input type="file" name="pic[]" value=""><br>
up pic: <input type="file" name="pic[]" value=""><br>
up pic: <input type="file" name="pic[]" value=""><br>
up pic: <input type="file" name="pic[]" value=""><br>

<input type="submit" value="upload" /><br>

</form>