[RESOLVED] Invalid argument warning

[tryin_to_learn]

I'm getting a Warning: Invalid argument supplied for foreach() error message for this bit of code:

		foreach($_POST['healthConditions[]'] as $key=>$value) {
			if($count > 1){
					$_SESSION['saFormData'] .= " $value, ";
					$count--;
			} else {	
					$_SESSION['saFormData'] .= " $value.<br>";
			}	
		}

I've done some research that said that this warning either means you've got a string instead of an array or that the array is null. Mine is obviously an array because its data that's being passed from a form via post. However, the warning goes away if a user has checked any of the healthConditions boxes so I guess it's because the array can be returned as NULL if they don't check any. I tried putting

$_POST['healthConditions'] = array("");

and even

$_POST['healthConditions'] = array("anything");

at the beginning of the code, before the real post value gets set, but that didn't help. What else can I try? The way the form is worded, the user needs to have the option of leaving all checkboxes blank.

[laserlight]

What else can I try?

[man]isset[/man] followed by [man]is_array/man

[kitchin]

tryin_to_learn wrote:

I tried putting

$_POST['healthConditions'] = array("");

and even

$_POST['healthConditions'] = array("anything");

at the beginning of the code, before the real post value gets set, but that didn't help.

I don't think you can do that. The $_POST value is set before line one. You can change or delete it, but then you won't have the user's posted data.

Also, you probably want to make this correction:

// foreach($_POST['healthConditions[]'] as $key=>$value) {
   foreach($_POST['healthConditions'] as $key=>$value) {

[tryin_to_learn]

The solution ended up being a combination of what each of you had suggested. Thanks.