这段代码非常有用，如果你下载了一个文件，网站提供了hash结果，你可以对你下载下来的文件进行hash运算，以验证下载的文件是否正确。
Hash (Check) Files
if(!empty($_FILES)){
if ($_FILES["file"]["error"] > 0){
switch($_FILES["file"]["error"]){
case 1:
echo "Error: The uploaded file exceeds the upload_max_filesize directive in php.ini
break;
case 2:
echo "Error: The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.
break;
case 3:
echo "Error: The uploaded file was only partially uploaded.
break;
case 4:
echo "Error: No file was uploaded.
break;
case 6:
echo "Error: Missing a temporary folder.
break;
case 7:
echo "Error: Failed to write file to disk.
break;
case 8:
echo "Error: A PHP extension stopped the file upload.
break;
default:
echo "Unknown error occured.
}
} else {
echo 'Upload: ' . $_FILES['file']['name'] . '
echo 'Type: ' . $_FILES['file']['type'] . '
echo 'Size: ' . (round($_FILES['file']['size'] / 1024, 2)) . ' Kb
if(array_search($_POST['algo'], hash_algos())===false){
echo 'Unknown hashing algorithm requested.
} else {
echo 'Hashing Algorithm: '. $_POST['algo'] . '
$hash = hash_file($_POST['algo'], $_FILES['file']['tmp_name']);
echo 'Calculated hash: ' . $hash . '
if($_POST['exphash']!=='none' && !empty($_POST['exphash'])){
echo 'Expected hash: ' . $_POST['exphash'] . '
echo ($hash==$_POST['exphash'])? 'Hash matched expected value. ' : 'Hash did not match expected value. ';
echo '
}
}
}
?>
Again
} else {
?>
}
?>
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