Simple examples and instructions for uploading files with PHP

Upload filesExample

First build a form

<code><span><<span>html</span>></span><span><<span>body</span>></span><span><<span>form</span><span>action</span>=<span>"upload.php"</span><span>method</span>=<span>"post"</span><span>enctype</span>=<span>"multipart/form-data"</span>></span><span><<span>input</span><span>type</span>=<span>"file"</span><span>name</span>=<span>"file"</span>/></span><span><<span>input</span><span>type</span>=<span>"submit"</span><span>value</span>=<span>"submit"</span><span>name</span>=<span>"submit"</span>></span><span></<span>form</span>></span><span></<span>body</span>></span><span></<span>html</span>></span></code>

that can

upload files

. In the form, after submission, it will be handed over to upload.php for processing. Let’s write the simplest upload handler:

<code><span><?php</span>
var_dump(<span>$_POST</span>);
var_dump(<span>$_FILES</span>);

<span>$uploadPath</span> = <span>'./upload/'</span>;
<span>$tempFileName</span> = <span>$_FILES</span>[<span>'file'</span>][<span>'tmp_name'</span>];
<span>$uploadFileName</span> = <span>$uploadPath</span>.<span>$_FILES</span>[<span>'file'</span>][<span>'name'</span>];
<span>if</span>(move_uploaded_file(<span>$tempFileName</span>,<span>$uploadFileName</span>)){
  <span>echo</span><span>'upload success'</span>;
}<span>else</span>{
  <span>echo</span><span>'upload fail'</span>;
}</code>

Visit the submission page and submit the form. You can see the following output:

<code><span>array</span> (size=<span>1</span>)
  <span>'submit'</span> => string <span>'submit'</span> (length=<span>6</span>)
<span>array</span> (size=<span>1</span>)
  <span>'file'</span> =>
    <span>array</span> (size=<span>5</span>)
      <span>'name'</span> => string <span>'laravel-quickstart-welcome.png'</span> (length=<span>30</span>)
      <span>'type'</span> => string <span>'image/png'</span> (length=<span>9</span>)
      <span>'tmp_name'</span> => string <span>'/tmp/phpYKQKaY'</span> (length=<span>14</span>)
      <span>'error'</span> => int <span>0</span><span>'size'</span> => int <span>91148</span>
upload success</span></code>

The output illustrates two points: The content submitted by the input type=file will appear in the

$_FILES

array. Use input's
1. name field as its index in the $_FILESarray. The content submitted by input with type=file will continue to appear in the $_POST
array. The structure of the array corresponding to each file in the
$_FILES

array is as follows:

name

• The file name of the uploaded filetype
• The type of the uploaded filetmp_name
PHP
• After uploading the file, ​​it will be stored in the temporary directory first. tmp_name displays the path of the temporary fileerror
to store the error code
• size
• The size of the uploaded file, ​​in bytesSo PHP
The idea of ​​uploading files

is relatively simple. After the file is uploaded, the information will be saved in the

$_FILES array. You can verify the file as needed (such as the suffix name), and then use the move_uploaded_file function to copy the temporary file Go to your upload directory. Notes

from form must set the

enctype="multipart/form-data"

attribute, otherwise it cannot be uploaded
• The folder in the upload path must exist, otherwise an error will be reported

<code>failed to open stream: No such file or directory
</code>

Do not use other function copies To upload a file, please use the

move_uploaded_file

function. Because this function will verify whether the temporary file is a file uploaded through PHP, this can avoid mistakenly copying system files to the upload directory.

If necessary, you can use

is_uploaded_file

to determine whether a file was uploaded through PHP.

If the file corresponding to the path of the second parameter of move_uploaded_file

already exists, it will be overwritten.

Reference:

PHP file upload

PHP: move_uploaded_file - Manual
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The above introduces simple examples and instructions for uploading files in PHP, including uploading files and indexing. I hope it will be helpful to friends who are interested in PHP tutorials.