How to use the array_pad () function in php

This article mainly explains "how to use the array_pad() function in php". The explanation in this article is simple and clear, easy to learn and understand. Please follow the ideas of Xiaobian slowly and deeply to study and learn "how to use the array_pad() function in php" together!

The array_pad($array,$size,$value) function inserts a key value $value into the array $array, padding the array to the specified length $size. (The $size argument can be understood as the final number of elements in the array, i.e. the length of the array after the insert operation).

Let's take a closer look at the following examples:

From array_pad($arr,5,1), we can see that if the value of $size is 5, there are 5 elements in the array after the insertion operation; there are 3 elements in the original, so only 2 elements need to be inserted. Since the insertion value $value is 1, only two elements with the value "1" need to be inserted.

The array_pad() function can insert elements at the end of the array, in fact, the array_pad() function can also insert elements at the beginning of the array; and the key is the $size parameter.

The $size parameter has three values:

is positive, insert elements at the end of the array;

is negative, inserts elements at the beginning of the array;

If its absolute value is less than or equal to the length of the $array, no insert is performed.

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