PHP multiple file upload operation_PHP tutorial

PHP multi-file upload operation

​

In fact, multiple file uploads and single file uploads are similar. The principles are the same, but there are some tricks in the code.

The first is the index.html upload form, but the file in the previous file upload form is changed to file[]

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Upload file:

Upload file:

Upload file:

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Use $_FILES in upload.php to print it

print_r($_FILES);

?>

Get the following multi-dimensional array

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Array

(

[file] => Array

(

[name] => Array

          (

                  [0] => Photo 1.jpg

                  [1] => Photo 2.jpg

                                                                                                                                                                                                                                                               

        )

[type] => Array

          (

                                                                                                                                                                   

                                                                                                                                                                                               

                                                                                                                                                                                                           

        )

[tmp_name] => Array

          (

                                                                                                                        [0] => [1] => [2] =>

        )

[error] => Array

          (

                  [0] => 0

                    [1] => 0

                  [2] => 0

        )

[size] => Array

          (

                  [0] => 0

                  [1] => 0

                  [2] => 0

        )

)

)

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According to the principle of single file upload, first think about what we need to get?

Obviously we need to get an array of file information. The array contains name, type, tmp_name, error, size. What we get at this time is a multi-dimensional array. Although the corresponding key values ​​exist, it is multi-dimensional. ,

We only need to split it, such as the three files above, we only need to split it into the corresponding three file information arrays.

Structure of split array

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Array

(

[0] => Array

(

             [name] => Photo 1.jpg

[type] => image/jpeg

>

                                                                                                                                                                                                                 ​ >

)

[1] => Array

(

[name] = & gt; Photo 2.jpg

[type] => image/jpeg

>

                                                                                                                                                                                                                 ​ >

)

[2] => Array

(

[name] => Photo 3.jpg

[type] => image/jpeg

>

                                                                                                                                                                                                                 ​ >

)

)

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The following is the code for splitting and reorganizing the array

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//print_r($_FILES['file']);

$arr=$_FILES['file'];

$files=array();

for($i=0;$i

$files[$i]['name']=$arr['name'][$i];

$files[$i]['type']=$arr['type'][$i];

$files[$i]['tmp_name']=$arr['tmp_name'][$i];

$files[$i]['error']=$arr['error'][$i];

$files[$i]['size']=$arr['size'][$i];

}

print_r($files);

?>

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The rest is simple. Just repeat the steps of uploading a single file and iterate through the array.

The code is as follows:

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//print_r($_FILES['file']);

$arr=$_FILES['file'];

$files=array();

for($i=0;$i