Definition and Usage
定义和用法

The is_uploaded_file() function checks whether the specified file is uploaded via HTTP POST.
is_uploaded_file()函数的作用是：判断文件是否是通过HTTPPOST上传的。

This function returns TRUE if the file is uploaded via HTTP POST.
如果文件是通过HTTPPOST上传的，那么该函数将返回True。

Syntax
语法

is_uploaded_file(file)

Tips and Notes
注意点

Note: The result of this function are cached. Use clearstatcache() to clear the cache.
注意：这个函数的结果将被自动缓存。你可以使用clearstatcache()函数来清除这个缓存。

Example
案例

<?php
$file = "test.txt";
if(is_uploaded_file($file)) { echo ("$file is uploaded via HTTP POST"); }
else { echo ("$file is not uploaded via HTTP POST"); }
?>

The output of the code above could be:
上述代码将输出下面的结果：

test.txt is not uploaded via HTTP POST

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