PHP is_uploaded_file() 函數
定義和用法
is_uploaded_file() 函數檢查指定的文件是否是通過HTTP POST 上傳的。
如果文件是通過HTTP POST 上傳的,該函數返回TRUE。
語法
is_uploaded_file(file)
参数 | 描述 |
---|---|
file | 必需。规定要检查的文件。 |
提示和註釋
註釋:該函數的結果會被緩存。請使用clearstatcache() 來清除緩存。
實例
<?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");
}
?>
上面的代碼將輸出:
test.txt is not uploaded via HTTP POST
完整的PHP Filesystem參考手冊