Zend Preparation | PHP Quiz (Learning Mode)

Arrays Learning Mode

Qusetions Index 8/40

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

You run the following code:

<?php
$array = array("a1"=>"x","a2"=>"e","a3"=>"z");
ksort( $array );

foreach ( $array as $keys => $values ) {
  print "$keys = $values ";
}
?>

What will be the output?

a1 = x a2 = e a3 = z

a1 = e a2 = x a3 = z

0 = e 1 = x 2 = z

The script will throw an error message.

Explanation: Answer option A is correct.

The ksort() function accepts an associative array and sorts its keys either alphabetically if any strings are present, or numerically if all elements are numbers. However, it does not sort the elements of the associative array. Consider the PHP script given in the question:

    <?php
    $array = array("a1"=>x,"a2"=>e,"a3"=>z);
    ksort( $array );

    foreach ( $array as $keys => $values ) {
     print "$keys = $values ";
    }
    ?>

Output:Since the ksort() function only sorts the keys of the array not its elements and the keys of the given array are already sorted, the output array will be the same as input array. Hence, the output will be as follows:

a1 = x a2 = e a3 = z

Reference: http://in2.php.net/manual/en/function.ksort.php