PHP is_uploaded_file() 函数
PHP Filesystem 函数定义和用法
is_uploaded_file() 函数检查指定的文件是否是通过 HTTP POST 上传的。
如果文件是通过 HTTP POST 上传的，该函数返回 TRUE。
语法
is_uploaded_file(file)
| 参数 | 描述 |
|---|---|
| file | 必需。规定要检查的文件。 |
提示和注释
注释：该函数的结果会被缓存。请使用 clearstatcache() 来清除缓存。
实例
<?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");
}
?>
$file = "test.txt";
if(is_uploaded_file($file))
{
echo ("$file is uploaded via HTTP POST");
}
else
{
echo ("$file is not uploaded via HTTP POST");
}
?>
上面的代码将输出：
test.txt is not uploaded via HTTP POST
