Use the array_unshift () function in php to insert elements at the beginning of an array

Php inserts the element function array_unshift () at the beginning of the array. Before we know this function, we need to insert some elements in front of the data, which is complicated. we need to use traversal to perform operations, or we need to insert them to the back, next we will share a practical arra. before we know this function, we need to insert some elements in front of the data. we think it is very complicated. we need to use traversal to operate it, or we should just insert it to the back, next we will share a practical array_unshift () function, which can solve all problems.

Let's not talk about the instance first.

#1 array_unshift () example