is_uploaded_file

is_uploaded_file 是 PHP 语言中的一个函数，用于判断一个文件是否是通过 HTTP POST 上传的。该函数需要一个文件路径作为参数，如果该文件是通过 HTTP POST 上传的，则返回 true，否则返回 false。注意，该函数只能用于判断通过 HTTP POST 方式上传的文件，不能用于判断其他方式上传的文件。

相关问题

if (is_uploaded_file($_FILES['file']['tmp_name'])) 是什么意思

`if (is_uploaded_file($_FILES['file']['tmp_name']))` 是一个条件语句，用于判断上传的文件是否成功。

`$_FILES['file']['tmp_name']` 是一个 PHP 的预定义变量，用于临时存储上传的文件。`is_uploaded_file()` 函数用于检查指定的文件是否是通过 HTTP POST 上传的。

如果条件成立，即 `is_uploaded_file()` 函数返回 `true`，则表示文件成功上传；如果条件不成立，即 `is_uploaded_file()` 函数返回 `false`，则表示文件上传失败。

PHP move_uploaded_file

move_uploaded_file is a PHP function that is used to move an uploaded file to a new location. This function is typically used in conjunction with the $_FILES superglobal variable, which contains information about the uploaded file.

The syntax for move_uploaded_file is as follows:

move_uploaded_file($filename, $destination);

The first parameter, $filename, is the name of the file that was uploaded. The second parameter, $destination, is the new location where the file should be moved.

Here is an example of how to use move_uploaded_file in a PHP script:

<?php
if(isset($_FILES['file'])){
$filename = $_FILES['file']['name'];
$tmp_name = $_FILES['file']['tmp_name'];
$destination = "uploads/" . $filename;
move_uploaded_file($tmp_name, $destination);
echo "File uploaded successfully";
}
?>

In this example, the script checks if a file has been uploaded using the $_FILES superglobal variable. If a file has been uploaded, it gets the name and temporary location of the file from the $_FILES variable. It then sets the destination folder for the uploaded file and uses the move_uploaded_file function to move the file from its temporary location to the destination folder. Finally, the script outputs a message to let the user know that the file has been uploaded successfully.