File Validation

1. data (array) (filename, file dir to move) (required)
2. acceptable (array) (optional)
3. max_size (Max uploaded File Size) (optional)
4. $direction (error action ) (optional)

acceptable

1. Default accepted (
   array('image/jpeg','image/jpg','image/gif','image/png')
   )

direction

1. Reload (Will Reload if any condition false )
2. "" (Will Redirect Reffered url if condition false)

$data = ['upload_img'=>'moved_to_dir'];

filevalidation($data, $acceptable = null, $max_size = null, $direction = null)
  
// if condition true then this area will execute