存储字符串会导致数组php

Question

I have a function that takes an id, does some database querying and then returns an array of results. $str[0] is a string containing error messages, $str[1] is a string containing warning messages. I want to store these 2 messages in a $err and $warning array. Then i want to display the $err messages in an alert box. i have echo'ed out '$results['0'] to check to function is returning the messages i want, and it does.

The problem is storing in the $errs array i think. No alert box shows when i have the foreach loop, commenting it out makes the alert appear, so the problem lies in the $errs array, any ideas why?

$i = 0;  
$errs = array();
$warnings = array();
foreach ($_POST["whisky_pack"] as $whisky) { 
    $results = checkStock($whisky, $qty[$i]);
    $errs[] = $results[0];
    $warnings[] = $results[1];
    $i++;
} 

if($errs){
    echo '<script>alert(\'';
    foreach($errs as $e){
        echo $e;
    }
    echo '\');</script>';
}