PHP is_uploaded_file()用法及代码示例

is_uploaded_file() 函数检查文件是否通过 HTTP POST 上传。如果文件是通过 HTTP POST 上传的，则该函数返回 TRUE。失败时返回 FALSE。

用法

is_uploaded_file(file_path)

参数

• file_path −指定要检查的文件。

返回

如果文件是通过 HTTP POST 上传的，则 is_uploaded_file() 函数返回 TRUE。失败时返回 FALSE。

假设我们正在上传包含以下内容的文件 “new.txt”。

This is demo text!

示例

<?php
   // checking for file is uploaded via HTTP POST
   if (is_uploaded_file($_FILES['userfile'][‘new.txt'])) {
      echo "File ". $_FILES['userfile'][‘new.txt'] ." uploaded successfully!\n";
      // displaying contents of the uploaded file
      echo "Reading Contents of the file:\n";
      readfile($_FILES['userfile'][‘new.txt']);
   } else {
      echo "File ". $_FILES['userfile'][‘new.txt'] ." failed in uploading! File upload attack could       be the reason!\n";
   }
?>

输出

File new.txt uploaded successfully!
Reading Contents of the file:
This is demo text!

让我们看另一个例子，文件 “details.txt”。

示例

<?php
$file = "newdetailstxt";
if(is_uploaded_file($file)) {
   echo ("Uploaded via HTTP POST");
} else {
   echo ("Not uploaded via HTTP POST");
}
?>

输出

Not uploaded via HTTP POST!