What is an array in PHP?

An array in PHP is actually an ordered map. A map is a type that associates values to keys. This type is optimized for several different uses; it can be treated as an array, list (vector), hash table (an implementation of a map), dictionary, collection, stack, queue, and probably more.

What does in_array() do in PHP?

The array. If the third parameter strict is set to true then the in_array () function will also check the types of the needle in the haystack . Prior to PHP 8.0.0, a string needle will match an array value of 0 in non-strict mode, and vice versa. That may lead to undesireable results. Similar edge cases exist for other types, as well.

What is a multidimensional array in PHP?

Multidimensional arrays - Arrays containing one or more arrays The count () function is used to return the length (the number of elements) of an array: For a complete reference of all array functions, go to our complete PHP Array Reference.

Is there an array aggregation function in PHP?

While there are a lot of array functions in the PHP libs, there also seem to be a lot of rudimentary ones missing. If you are using Venn diagrams to think about your arrays, then these functions might be for you. I was looking for an array aggregation function here and ended up writing this one.