How to perform hash operation on files in php_PHP tutorial

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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 {

?>

}

?>