is_uploaded_file

(PHP 4 >= 4.0.3, PHP 5, PHP 7, PHP 8)

is_uploaded_file — Tells whether the file was uploaded via HTTP POST

Опис

is_uploaded_file(string $filename): bool

Returns true if the file named by filename was uploaded via HTTP POST. This is useful to help ensure that a malicious user hasn't tried to trick the script into working on files upon which it should not be working--for instance, /etc/passwd.

This sort of check is especially important if there is any chance that anything done with uploaded files could reveal their contents to the user, or even to other users on the same system.

For proper working, the function is_uploaded_file() needs an argument like $_FILES['userfile']['tmp_name'], - the name of the uploaded file on the client's machine $_FILES['userfile']['name'] does not work.

Параметри

filename: The filename being checked.

Значення, що повертаються

Повертає true у разі успіху або false в разі помилки.

Приклади

Приклад #1 is_uploaded_file() example

<?php

if (is_uploaded_file($_FILES['userfile']['tmp_name'])) {
   echo "File ". $_FILES['userfile']['name'] ." uploaded successfully.\n";
   echo "Displaying contents\n";
   readfile($_FILES['userfile']['tmp_name']);
} else {
   echo "Possible file upload attack: ";
   echo "filename '". $_FILES['userfile']['tmp_name'] . "'.";
}

?>

Прогляньте також

move_uploaded_file() - Moves an uploaded file to a new location
$_FILES
See Handling file uploads for a simple usage example.