Simple examples and instructions for uploading files with PHP-PHP Tutorial-php.cn

Simple examples and instructions for uploading files with PHP

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Release： 2016-07-29 09:12:22

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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>

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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>

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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>

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

$_FILES

name field as its index in the $_FILESarray. The content submitted by input with type=file will continue to appear in the $_POST

array is as follows:

name

The file name of the uploaded filetype
The type of the uploaded filetmp_name
After uploading the file, it will be stored in the temporary directory first. tmp_name displays the path of the temporary fileerror
size
The size of the uploaded file, in bytesSo PHP

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"

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>

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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

').addClass('pre-numbering').hide(); $(this).addClass('has-numbering').parent().append($numbering); for (i = 1; i

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.