PHP file upload implementation ideas for multiple file uploads, _PHP tutorial

The implementation idea of ​​multiple file upload in PHP file upload,

Two situations of multiple file upload

①Use multiple name values

<input type="file" name="file1">
<input type="file" name="file2">
<input type="file" name="file3">
<input type="file" name="file4">

a. Data format received after clicking submit

Array
(
[file1] => Array
(
[name] => 8.png
[type] => image/png
[tmp_name] => G:\wamp\tmp\php737.tmp
[error] => 0
[size] => 200
)
[file2] => Array
(
[name] => 28.png
[type] => image/png
[tmp_name] => G:\wamp\tmp\php738.tmp
[error] => 0
[size] => 6244
)
[file3] => Array
(
[name] => 54a296f8n6787b34c.png
[type] => image/png
[tmp_name] => G:\wamp\tmp\php739.tmp
[error] => 0
[size] => 3143
)
[file4] => Array
(
[name] => 54c0573dncb4db6f7.jpg
[type] => image/jpeg
[tmp_name] => G:\wamp\tmp\php788.tmp
[error] => 0
[size] => 5404
)
)

As can be seen from this format, each file corresponds to an array unit

So use foreach to traverse the array and call the file upload function for each array unit

b. Operations after clicking submit

①Receive uploaded file information

$file = $_FILES;

②Introducing the upload function

include('./functions.php');

③Set file saving path

$path = './uploads/'; // 此目录需要手动创建

④Call the file upload function

foreach($file as $v){
$info = uploadFile($v,$path);
⑤判断上传状态
if($info['isok']){
echo '上传成功'.$info['message'];
} else {
echo '上传失败'.$info['message'];
}
}

------------------------------------------------- ----------------

②Use a single name value

a. The first way of writing

<input type='file' name="file[]">
<input type='file' name="file[]">
<input type='file' name="file[]">

b. The second way of writing

<input type="file" name="file[]" multiple>

c. After clicking submit, the data format received

Array
(
[userpic] => Array
(
[name] => Array
(
[0] => 8.png
[1] => 9b2d7581fba543ec9bcf95e91018915a.gif
[2] => 12.jpg
)
[type] => Array
(
[0] => image/png
[1] => image/gif
[2] => image/jpeg
)
[tmp_name] => Array
(
[0] => G:\wamp\tmp\php85E5.tmp
[1] => G:\wamp\tmp\php85E6.tmp
[2] => G:\wamp\tmp\php8635.tmp
)
[error] => Array
(
[0] => 0
[1] => 0
[2] => 0
)
[size] => Array
(
[0] => 200
[1] => 16503
[2] => 19443
)
)
)

As can be seen from this format, the uploaded file information is saved separately in each subscript.
So what we have to do is to splice out a complete file information, a one-dimensional array

Array(
[name] => 54c0573dncb4db6f7.jpg
[type] => image/jpeg
[tmp_name] => G:\wamp\tmp\php788.tmp
[error] => 0
[size] => 5404
)

So the operation to be performed is to traverse $_FILES['file'] and then retrieve the information of each uploaded file

d. Operations after clicking submit

①Receive uploaded file information

$file = $_FILES['file'];

②Introducing the upload function

include('./functions.php');

③Set file saving path

$path = './uploads/'; // This directory needs to be created manually

④Call the file upload function

foreach($file['name'] as $key=>$value){
$data['name'] = $file['name'][$key];
$data['type'] = $file['type'][$key];
$data['tmp_name'] = $file['tmp_name'][$key];
$data['error'] = $file['error'][$key];
$data['size'] = $file['size'][$key];
$info = uploadFile($data,$path);

⑤ Determine upload status

if($info['isok']){
echo '上传成功'.$info['message'];
} else {
echo '上传失败'.$info['message'];
}
}

a. Traverse $file['name'] just to get $key

b. Each time it is traversed, take out the file information corresponding to the subscript and assign it to the corresponding key in a new array

For example, $key = 0 for the first time;

$data['name'] = $file['name'][0]; // 相当于取出了第一个文件的名字
$data['type'] = $file['type'][0]; // 相当于取出了第一个文件的类型

...

After the first traversal is completed

$data = array(
[name] => 54c0573dncb4db6f7.jpg
[type] => image/jpeg
[tmp_name] => G:\wamp\tmp\php788.tmp
[error] => 0
[size] => 5404
);

This will retrieve all the information of the first file

Then call the upload function to perform file upload processing

$key=1 during the second traversal, which is equivalent to obtaining the information of the second uploaded file

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