1. How to access elements from multi-dimensional array in C#? You can also extract an array from a set of matched/excluded keys. This method takes a one-dimensional array as input and creates a multi-dimensional array with a depth equal to the number of columns desired. I want to group the values in this and know how many. Converting a multidimensional array to 2 single dimensional arrays. Despite that array_column will work nice here, in case you need to flatten any array no matter of it's internal structure you can use this array library to achieve it without ease: which will produce exactly the array you want. For example, if I want to get the segments of the URI, I first think, “CodeIgniter must have that!” If I want a function to convert input from a