PHP获取上传文件的md5码_PHP教程

if(isset($_FILES['multimedia']) && $_FILES['multimedia']['error']==0)
{
	$file_name = $_FILES['multimedia']['name'];
	$size = getimagesize($_FILES['multimedia']['tmp_name']);
    $type = $_FILES['multimedia']['type'];
	$original = $_FILES['multimedia']['tmp_name'];
	$md5 = md5_file($original);
	echo $md5;
}

<?php
$filename = "test.txt";
$md5file = md5_file($filename);
echo $md5file;
?>

<?php
$md5file = md5_file("test.txt");
file_put_contents("md5file.txt",$md5file);
?>

<?php
$md5file = file_get_contents("md5file.txt");
if (md5_file("test.txt") == $md5file)
{
	echo "The file is ok.";
}
else
{
	echo "The file has been changed.";
}
?>  

The file is ok.