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@ 2014-06-30T10:02:00Z

<?php
$books = array(
    0 => 'BBook',
    1 => 'ABook',
    2 => 'BBook',
);

$rbooks = array_flip($books);
var_dump($rbooks );

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_flip: documentation ( source)

preferences:dark modelive preview

31.4 ms | 402 KiB | 5 Q