PHP array_flip() Function

Flip all keys with their associated values in an array:

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

Definition and Usage

The array_flip() function flips/exchanges all keys with their associated values in an array.

array_flip( array)

Parameter	Description
array	Required. Specifies an array of key/value pairs to be flipped

Return Value:	Returns the flipped array on success. NULL on failure
PHP Version:	4+