061-a - Array Flip
Array
(
    [10] => Bill
    [20] => Joe
    [30] => Peter
)

061-b - array_change_key_case
Array
(
    [bill] => 10
    [joe] => 20
    [peter] => 30
)

061-c - CASE_UPPER or CASE_LOWER
Array
(
    [BILL] => 10
    [JOE] => 20
    [PETER] => 30
)
<?php // 061-a - Array Flip echo "</br><span class='myheading'>061-a - Array Flip</span></br>"; $a = array( "Bill" =>10, "Joe" => 20, "Peter" => 30 ); $newArray = array_flip($a); echo "<pre>"; print_r($newArray); echo "</pre>"; // 061-b - array_change_key_case echo "</br><span class='myheading'>061-b - array_change_key_case</span></br>"; $newArray2 = array_change_key_case($a); echo "<pre>"; print_r($newArray2); echo "</pre>"; //default is lower case // 061-c - CASE_UPPER or CASE_LOWER echo "</br><span class='myheading'>061-c - CASE_UPPER or CASE_LOWER</span></br>"; $newArray3 = array_change_key_case($a, CASE_UPPER); echo "<pre>"; print_r($newArray3); echo "</pre>"; ?>