php check if specific input empty code example

Example 1: php check if specific input empty

/*
  =============Input Type File=============
*/
$is_uploading = $_FILES["inputfilename"]["error"];
/*
  the variable $is_uploading has value either 0 or 4
  0 => the user is uploading specific files or images
  4 => user is not uploading anything
*/
$can_pass = $is_uploading == 0 ? true : false;
if($can_pass){
  echo "You can Pass";
}
else{
  echo "Please upload. Your request has empty files.";
}

Example 2: php if input is empty

$a = empty($a) ? "Default value" : $a;