PHP function library application array_pad()

PHP is a widely used server-side scripting language, and in the PHP function library, there is a very convenient function-array_pad(), which can add a specified number of values ​​to the end of an array.

This function can receive three parameters, which are the array that needs to be processed, the number of elements that need to be added, and the value corresponding to the new element. When the number of new elements is greater than the number of elements in the original array, the original array will be completely filled until the number of new elements is met.

Let's use it to show the usage of array_pad():

Suppose there is an array $arr = ['apple', 'banana'], and now we need to increase the size of the array to 5, and the value of the new element is 'orange'.

The code is as follows:

$arr = ['apple', 'banana'];
$new_arr = array_pad($arr, 5, 'orange');
print_r($new_arr);

The output result of this code is:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => orange
    [4] => orange
)

We can see that the array_pad() function adds the array $arr that needs to be processed at the end Add three elements and set the value of all new elements to 'orange'.

Using this function can make our code more concise and clear, and at the same time avoid unnecessary adding elements one by one.

In addition to the above usage, this function can also fill the array to the specified length based on the value of the new element. For example, if there are three elements in the array $arr, we want to fill it to a length of 7, and we need to increment the value of the new element starting from 1.

The code is as follows:

$arr = [2, 4, 6];
$new_arr = array_pad($arr, 7, 1);
print_r($new_arr);

The output result is as follows:

Array
(
    [0] => 2
    [1] => 4
    [2] => 6
    [3] => 1
    [4] => 1
    [5] => 1
    [6] => 1
)

We can see that the array_pad() function fills the $arr array to a length of 7 and adds new The value of the element is filled in according to the rule of increasing by 1 each time.

In short, the array_pad() function provides us with a convenient and fast method when operating arrays, which can greatly reduce the time and amount of code we spend writing tedious array filling code, and also make the code more concise. Clearly.

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