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array_flip()

 <?php

$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$result=array_flip($a1);
print_r($result);
?>


OutPut:
Array ( [red] => a [green] => b [blue] => c [yellow] => d )


Syntex:
array_flip(array)
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