array_flip() function exchanges all key and element values for the array. : array_flip « Data Structure « PHP

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array_flip() function exchanges all key and element values for the array.

 
//Its syntax is: array array_flip(array array)

<?
    $l = array("a" => "A","b" => "B","q" => "Q");
    $l = array_flip($l);
    print_r($l);
?>

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