Compare arrays, and returns the differences (compare values only, using a user-defined key comparison function) array_udiff_assoc() Compare arrays, and returns the differences (compare keys and values, using a built-in function to compare the keys and a user-defined function to compare the values) array_udiff_uassoc() Compare arrays, and returns the differences (compare keys and values, using two user-defined key comparison functions)
Instagram usage is particularly strong among millennials. This year, there will be 48.2 million millennial Instagram users in the US. By 2019, nearly two-thirds of all millennial smartphone users will use Instagram.
Demographics. 1  In Q2 2014, 20% of internet users aged 16-64 had an Instagram account. This is up from 15% in Q2 2013. 2  The app is more popular among younger people, with usage at 41% among those aged 16-24 and at 35% among 24-34s. 3  51% of users are male while, you guessed it, 49% are female.