How to parse an array in PHP.

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PHP

I am new in PHP and dont know much about array handling.I tried a number of ways to parse an array which is given below.But did'nt get the expected results.I need the key and the associated values for each.How can I parse this.Any one please help me to solve this.Thanks in advance.

My PHP code:

$store = array();
if (isset($_POST['question_id'])) {
foreach ($_POST['question_id'] as $key => $option) {
$store[$key]=$option;
}
print_r($store);
}

?>

Resultant array:

Array ( [2] => Array ( [0] => A lot of discussion; everyone participates [1] => The team is overloaded with people who have the same team player style ) [4] => Array ( [0] => High dependence )

Expected Result

2:A lot of discussion; everyone participates^The team is overloaded with people who have the same team player style

4:High dependence

Note:The symbol ^ is used to join the two values before inserting in the database.