$_POST
To determine whether upload was successful you should check for error being UPLOAD_ERR_OK instead of checking the file size. When nothing is chosen to be uploaded, the key in $_FILES will still be there, but it should have error equal UPLOAD_ERR_NO_FILE.
$_FILES
$HTTP_POST_FILES [非推奨]
$_FILES -- $HTTP_POST_FILES [非推奨] — HTTP ファイルアップロード変数
説明
HTTP POST メソッドで現在のスクリプトにアップロードされた項目の連想配列です。
$HTTP_POST_FILES は同じ情報を持っていますが、 これはスーパーグローバルではありません ($HTTP_POST_FILES と $_FILES は異なる変数であり、PHP はこれらを異なる変数として扱うことに注意してください)。
変更履歴
| バージョン | 説明 |
|---|---|
| 4.1.0 | $_FILES が導入され、 $HTTP_POST_FILES は非推奨となりました。 |
注意
注意: これは 'スーパーグローバル' あるいは自動グローバル変数と呼ばれるものです。 スクリプト全体を通してすべてのスコープで使用することができます。 関数やメソッドの内部で使用する場合にも global $variable; とする必要はありません。
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User Contributed Notes$_FILES
mwgamera at gmail dot com
13-Aug-2009 02:40
13-Aug-2009 02:40
calurion at gmail dot com
30-Jun-2009 01:51
30-Jun-2009 01:51
For some reason when I tried to check if $_FILES['myVarName'] was empty() or !isset() or array_key_exists(), it always came back that the file was indeed in the superglobal, even when nothing was uploaded.
I wonder if this is a result of enctype="multipart/form-data".
Anyways, I solved my issue by checking to make sure that $_FILES['myVarName']['size'] > 0
dewi at dewimorgan dot com
18-Mar-2009 07:35
18-Mar-2009 07:35
The format of this array is (assuming your form has two input type=file fields named "file1", "file2", etc):
Array
(
[file1] => Array
(
[name] => MyFile.txt (comes from the browser, so treat as tainted)
[type] => text/plain (not sure where it gets this from - assume the browser, so treat as tainted)
[tmp_name] => /tmp/php/php1h4j1o (could be anywhere on your system, depending on your config settings, but the user has no control, so this isn't tainted)
[error] => UPLOAD_ERR_OK (= 0)
[size] => 123 (the size in bytes)
)
[file2] => Array
(
[name] => MyFile.jpg
[type] => image/jpeg
[tmp_name] => /tmp/php/php6hst32
[error] => UPLOAD_ERR_OK
[size] => 98174
)
)
Last I checked (a while ago now admittedly), if you use array parameters in your forms (that is, form names ending in square brackets, like several file fields called "download[file1]", "download[file2]" etc), then the array format becomes... interesting.
Array
(
[download] => Array
(
[name] => Array
(
[file1] => MyFile.txt
[file2] => MyFile.jpg
)
[type] => Array
(
[file1] => text/plain
[file2] => image/jpeg
)
[tmp_name] => Array
(
[file1] => /tmp/php/php1h4j1o
[file2] => /tmp/php/php6hst32
)
[error] => Array
(
[file1] => UPLOAD_ERR_OK
[file2] => UPLOAD_ERR_OK
)
[size] => Array
(
[file1] => 123
[file2] => 98174
)
)
)
So you'd need to access the error param of file1 as, eg $_Files['download']['error']['file1']
andrewpunch at bigfoot dot com
17-Jan-2009 09:16
17-Jan-2009 09:16
If $_FILES is empty, even when uploading, try adding enctype="multipart/form-data" to the form tag and make sure you have file uploads turned on.