PHP » I/O » is_uploaded_file()
- Syntax:
- bool is_uploaded_file( string filename)
- filename
- The name of the file.
Checks if a file is an uploaded one.
Files can be uploaded by using the HTTP POST method. When uploaded, files get a temporary name and are placed in a temporary directory specified in the php.ini file. In older versions of PHP is_uploaded_file() was used to verify that a file is an uploaded file, for security reasons. Since move_uploaded_file() became available it is more commonly used, since uploaded files normally need moved from their temporary location.
Examples
Code:
<?php
if (!isset($_REQUEST["seenform"])) {
?>
<form enctype="multipart/form-data" action="is_uploaded_file.php" method="post">
Upload file: <input name="userfile" type="file">
<input type="submit" value="Upload">
<input type="hidden" name="seenform">
</form>
<?php
} else {
if (is_uploaded_file($_FILES["userfile"]["tmp_name"])) {
print "Uploaded file found";
// do something with the file here
} else {
print "Not an uploaded file";
}
}
?> Output:
Uploaded file found Explanation:
The first time the page is loaded, a form is shown where the user can upload a file. When the button is pressed, the file is posted back to the same page, where is_uploaded_file() is used to check for the file. However, move_uploaded_file() is the recommended function to use.
See Also:
