Fatal Error: Cannot use isset() on the result of an expression

Hi,

I got this error:
Fatal error: Cannot use isset() on the result of an expression (you can use “null !== expression” instead) in C:xampphtdocstestrecord_add.php on line 133

What does it mean ?

The line is this:

[code]
if(isset($form_questions_required_labels[$required_current_count] && $required_current_count && $required_count_end))
[/code]

Context:

[code]
foreach($form_questions_labels as $value)
{
$required_current_count_match = false;
$text_box_current_count_match = false;
$text_area_current_count_match = false;
$radio_button_current_count_match = false;
$drop_down_current_count_match = false;

$current_value_matched = false;

//Check if current Question is a * REQUIRED Question or not.
//There are 7 required questions: $form_questions_required_labels = array().
$required_current_count = ‘0’; $required_count_end = ‘6’; $required_current_count_match = false;
if(isset($form_questions_required_labels[$required_current_count] && $required_current_count && $required_count_end))
{
while($value != $form_questions_required_labels[$required_current_count] || $required_current_count != $required_count_end)
{
if($value == “$form_questions_required_labels[$required_current_count]”)
{
$current_required_label_number = $required_current_count;
$next_required_label_number = $required_current_count++;
$required_current_count_match = true;
$required_current_count = $required_count_end;

$current_value_matched = true;
}
else
{
$required_current_count++;
}
}
}
[/code]

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