php one-dimensional array adding value

PHP is an open source, server-side execution-based, interpreted scripting language. In PHP, an array is a very commonly used data structure that can store multiple elements. However, many times we need to add new elements to an existing one-dimensional array or increase the value of existing elements. Therefore, this article will introduce how to increase the value of a one-dimensional array in PHP.

1. Add elements at the end of the array

In PHP, if you want to add elements to an existing one-dimensional array, you can use the array_push() function. The function of array_push() is to push one or more elements to the end of the array. The specific form is as follows:

array_push($array, $element1, $element2, …)

Among them, $array is the one-dimensional array to which elements are to be added, $element1, $element2… are The element to add.

For example:

$arr ​​= array("apple", "orange", "banana");
array_push($arr, "pear", "watermelon") ;
print_r($arr);

The output result is:

Array
(

[0] => apple
[1] => orange
[2] => banana
[3] => pear
[4] => watermelon

)

You can see that through Using the array_push() function, two new elements are added to the end of the original array.

2. Add elements at the beginning of the array

In addition to adding elements at the end of the array, sometimes we also need to add elements at the beginning of the array. In PHP, you can use the array_unshift() function to achieve this. The function of array_unshift() is to insert one or more elements to the beginning of the array. The specific form is as follows:

array_unshift($array, $element1, $element2, …)

Among them, $array is the one-dimensional array to which elements are to be added, $element1, $element2… are The element to add.

For example:

$arr ​​= array("apple", "orange", "banana");
array_unshift($arr, "pear", "watermelon") ;
print_r($arr);

The output result is:

Array
(

[0] => pear
[1] => watermelon
[2] => apple
[3] => orange
[4] => banana

)

You can see that through Using the array_unshift() function, two new elements are added to the beginning of the original array.

3. Increase the value of existing elements

In addition to adding new elements, sometimes we also need to increase the value of existing elements in the array. In PHP, this can be achieved using the assignment operator (=). The specific form is as follows:

$array[$key] = $value;

where $array is the one-dimensional array to which the value is to be added, and $key is the subscript of the element to which the value is to be added. $value is the value to be added.

For example:

$arr ​​= array("apple" => 2, "orange" => 3, "banana" => 1);
$ arr["apple"] = 1;
print_r($arr);

The output result is:

Array
(

[apple] => 3
[orange] => 3
[banana] => 1

)

You can see that by using the assignment operator (=), the value of the "apple" element in the original array is increased by 1.

Summary

In PHP, you can add new elements to an existing one-dimensional array by using the array_push() function and array_unshift() function, and by using associative arrays and assignment operators (=) can increase the value of existing elements. These functions allow us to process array data more conveniently and improve PHP programming efficiency.

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