A utility file, originally designed for CodeIgniter, containing several utility functions for manipulating arrays.

###Functions:

• array_pluck() : grab all of the elements of a given key from an array of arrays
• array_print() : output array in human readable HTML
• array_flatten() : pulls all of the elements of each sub array up a level, repeated recursively for $level times
• array_filter_keys() : removes all elements that are in $filter_keys from the array, returns the filtered list
• any() : returns true if any element in the return returns true from the callback. if the callback is not set, will just test the truthiness of each element
• all() : returns true if all elements in the return returns true from the callback. if the callback is not set, will just test the truthiness of each element
• array_invoke() : calls the method on each object in an array, returns an array of the results