PHP8 adds a large number of convenient and practical functions for arrays

A large number of convenient and practical functions have been added to arrays in PHP8

PHP8 is the latest PHP version, released in November 2020, and brings many improvements and new features. One of the most notable new features are improvements to arrays. In PHP8, a large number of convenient and practical functions have been added to make array operations more convenient and efficient. This article will introduce several important new array functions in PHP8.

1. array_is_list()

In PHP8, the array_is_list() function can check whether the array is a numerically indexed sequential list, and if so, return true, otherwise return false. This function is very useful because it allows us to check whether the array conforms to certain structures and perform corresponding operations. Here is an example:

$array = [1, 2, 3, 4, 5];
if (array_is_list($array)) {
    // $array 是一个顺序列表
} else {
    // $array 不是一个顺序列表
}

2. array_contains()

array_contains() function can be used to find whether an array contains a specific value. This function is very practical because it saves us the step of manually traversing the array. Here is an example:

$array = [1, 2, 3, 4, 5];
if (array_contains($array, 3)) {
    // 数组包含值 3
} else {
    // 数组不包含值 3
}

3. array_first_key()

array_first_key() function can be used to return the key of the first element in an array. This function is very useful and can be used when we need to get the key of the first element in the array. Here is an example:

$array = ['foo' => 'bar', 'hello' => 'world'];
$first_key = array_first_key($array); // $first_key = 'foo'

4. array_key_first()

array_key_first() function can be used to return the first key of an array. This function is very practical and can be used when we need to get the value of the first key of the array. Here is an example:

$array = ['foo' => 'bar', 'hello' => 'world'];
$first_key = array_key_first($array); // $first_key = 'foo'

5. array_key_last()

array_key_last() function can be used to return the last key of an array. This function is very practical and can be used when we need to get the value of the last key of the array. Here is an example:

$array = ['foo' => 'bar', 'hello' => 'world'];
$last_key = array_key_last($array); // $last_key = 'hello'

6. array_last_key()

array_last_key() function can be used to return the key of the last element in an array. This function is very useful and can be used when we need to get the key of the last element in the array. Here is an example:

$array = ['foo' => 'bar', 'hello' => 'world'];
$last_key = array_last_key($array); // $last_key = 'hello'

7. array_is_associative()

array_is_associative() function can be used to check whether an array is an associative array. This function is very useful because it allows us to check whether the array conforms to certain structures and perform corresponding operations. The following is an example:

$array = ['foo' => 'bar', 'hello' => 'world'];
if (array_is_associative($array)) {
    // $array 是一个关联数组
} else {
    // $array 不是一个关联数组
}

Summary

PHP8 adds a large number of convenient and practical functions for arrays. These new functions make array operations more convenient and efficient. This article introduces several important array functions, including array_is_list(), array_contains(), array_first_key(), array_key_first(), array_key_last(), array_last_key(), and array_is_associative(). These functions allow us to more quickly examine the structure of an array, manipulate the elements in the array, and manipulate our data. If you haven't upgraded to PHP8 yet, now is the time!

The above is the detailed content of PHP8 adds a large number of convenient and practical functions for arrays. For more information, please follow other related articles on the PHP Chinese website!