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 array_merge do in PHP 5+?

array_merge ($a, $b) should do exactly what you want, at least with PHP 5+. I totally disagree with the term "append". Append really means that items of one array become elements of another (destination) array which might already has some elements, therefore changing the destination array.

How to add elements to an array in PHP?

If you want to add elements to the beginning of an array, you can use the array unshift method. One of the most widely used PHP add to array methods is the square bracket method. Most programmers prefer using this strategy because of its efficiency. It adds to an array without the overhead of calling a function, as opposed to the other ways.

What is array_push in PHP?

Description – Again, array_push () is a PHP language built-in function. $array1 and $array2 are the two arrays we are looking to merge. In this process, the next array will appear in the next position of the first position. For example, if $array1 has the 5 elements, in this case, the complete $array2 will be placed on the 6th position.