PHP implements md5 inspection file

[PHP] Code

//blog.qita.in
echo 'md5 check [directory md5 directory name, file is md5_file entire file content]';
$filename = "test.txt";
if(is_dir($filename)){
 $md5file = md5($filename);
}else{
 $md5file = md5_file($filename);
}
echo $md5file ;

//Save the md5 value of the original file to the md5file.txt file
//file_put_contents("md5file.txt",$md5file);

//Compare the original md5 value with the current md5 value to know the file Whether it has been modified
$md5file = file_get_contents("md5file.txt");
if (md5_file("test.txt") == $md5file){
 echo "The file is normal";
}else{
 echo "The file has been modified Modify";
}
?>

PHP