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<?php $books = array( 0 => 'BBook', 1 => 'ABook', 2 => 'BBook', ); $rbooks = array_flip($books); var_dump($rbooks );
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["BBook"]=> int(2) ["ABook"]=> int(1) }

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