A gist demonstrating a faster method to unique arrays in PHP. Embeded on my blog: http://mattsurabian.github.io/PHP/a-better-way-to-unique-arrays-in-php/

ArrayUniqueAlternative.php

// array_unique is WAY TOO SLOW!  This method is significantly faster.
array_flip(array_flip($arr));

// If you need new keys generated use array_keys
array_keys(array_flip($arr));