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.
Instagram: 400 million (September, 2015) While Instagram has seen its growth and engagement rates decrease over the past 11 months, the network is still a juggernaut. In just a short run of open advertising, the social network already has more monthly active advertisers (200,000 vs. 130,000) than Twitter.