Detailed explanation of multiple file and image upload examples in PHP, _PHP tutorial

Detailed explanation of multiple file and image upload examples in php,

The example in this article describes the method of uploading multiple files and images in PHP. Share it with everyone for your reference. The specific implementation method is as follows:

Multiple file uploads use the method of traversing the array to traverse the form array on the basis of single file upload and then upload the files to the server one by one. Let’s take a look at a simple multiple file upload example

Multiple file uploads and single file uploads are processed in the same way. You only need to provide several more input forms of type "file" on the client and specify different "name" attribute values. For example, in the following code, the user can select three local files to upload to the server at the same time. The client form is as follows:

Copy code The code is as follows:

Select file 1:

Select file 2:

Select file 3:

In the above code, the forms of three file types are organized together in the form of an array. When the above form is taught to the PHP script file mul_upload.php, the global array $_FILES is also used on the server side to store information about all the above files, but $_FILES has been converted from a two-dimensional array to a three-dimensional array, so that multiple Upload file information. In the script file mul_upload.php, use the print_r() function to output the contents of the $_FILES array. The code is as follows:

Copy code The code is as follows:

//Print the contents of the three-dimensional array $_FILES and check the structure of storing uploaded files
print_r($_FILES);
?>

After selecting three local files for submission, the output results are as follows

Copy code The code is as follows:

Array(
[myfile]=>Array(
                                                                                                                                                                                                                                                                                                        [0] = & gt; rav.ini // $ _ files ["myfile"] ["name"] [0] The name of the first upload file
                                                                                                                                                                              [2]=>NOTEPAD.EXE) //$_FILES["myfile"]["name"][2]The name of the third uploaded file
[Type] = & GT; Array (// $ _ Files ["MyFile"] ["Type"] Storage of the type of all uploaded files
                                                                                                                                                                                                                                                                                                          Since [1] = & GT; Application/OCTET-Stream // $ _ Files ["MyFile"] ["Type"] [1] The type of uploaded files
[2]=>application/octet-stream) //$_FILES["myfile"]["type"][2]The third uploaded file type
         [tmp_name]=>Array(
                [0]=>C:/WINDOWS/Temp/phpAF.tmp
                    [1]=>C:/WINDOWS/Temp/phpB0.tmp
​​​​​[2]=>C:/WINDOWS/Temp/phpB1.tmp)
         [error]=>Array(
                                   [0]=>0
                                      [1]=>0
                               [2]=>0)
         [size]=>Array(
                          [0]=>64
                          [1]=>1350
                       [2]=>66560))
)

By outputting the value of the $_FILES array, we can see that processing the upload of multiple files is the same as the upload of a single file, except that the structure of the $_FILES array is slightly different. This way a larger number of file uploads can be supported.
Examples are as follows:

Copy code

The code is as follows: