I am unable to check if my $check array is empty or contains information passed via post from a checkbox group.

if ($_POST) {
if ($error_array = validate_form() ) {
show_form ($error_array);
}
else {
process_form( );
}
}
else {
show_form ( );
}

function show_form($errors = []) {
include ("survey_inc. php");
}

function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);

return $data;
}

// valid name, valid email, not empty check box, and valid radio and not empty.
function validate_form() {
$errors = []; // start with empty array
$name = test_input($_POST['name']);
$email = test_input($_POST['email']);
$check = test_input($_POST['bucket']);
$radio = test_input($_POST['species']);

// checking to see if name is 2+ characters
if (strlen($name) < 2) {
$errors[] = "Name is too short or empty.";
}

// check email
if (! filter_var($email, FILTER_VALIDATE_EMAIL) ){
$errors[] = "Enter a valid email.";
}

// check check group
if (empty($check)) {
$errors[] = "Please select a Bucket list item, even if it's not on your list.";
}
/*if (!empty($check)) {
switch ($check) {
case "skydiving":
break;
case "rocky_mountain_climbing":
break;
case "bull_riding":
break;
default:
$errors[] = "Please select a bucket list item...from the list.";
}
}
else {
$errors[] = "Please select a bucket list item...even if it isn't one on your list!";
}
if (!empty($check)) {
if (in_array($check, $bucket_arr)) {
$errors[] = "Please select a bucket list item...from the list.";
}
} else {
$errors[] = "Please select a bucket list item...even if it isn't one on your list!";
}*/

//check radio item
/*
if (!empty($radio)) {
switch ($radio) {
case "yes":
break;
case "no":
break;
case "other":
break;
default:
$errors[] = "Please select your species...from the list.";
}
}
else {
$errors[] = "Please select your species...even if you lie!";
}
*/
if (!empty($radio)) {
if (in_array($radio, $species_arr)) {
$errors[] = "Please select your species...from the list.";
}
} else {
$errors[] = "Please select your species...even if you lie!";
}

return $errors;
}

function process_form() {
$name = test_input($_POST['name']);
$email = test_input($_POST['email']);
$check = test_input($_POST['bucket']);
$radio = test_input($_POST['species']);

echo $name."\n", $email."\n", $check."\n", $radio."\n";
}

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Explanation:

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.

Nobody likes a short, one-word-answer. Let’s make sure other people understand everything.