How many points does php bisect a group?

In PHP development, we often encounter the need to divide an array into several equal parts. For example, a set of data is evenly distributed to multiple users for processing according to a fixed number of copies. So how to write code to implement this function in PHP? This article will introduce it in detail.

1. The concept and requirements of array bisection

Array bisection is to allocate an array according to a fixed number of parts, and each part contains an equal number of elements. For example, there is an array A containing 10 elements. If A needs to be divided into 5 equal parts, each part will contain 2 elements.

In actual development, we often need to divide an array into several equal parts according to different business needs. The number of equal parts and the number of elements are not fixed and need to be dynamically calculated according to specific needs.

2. How to achieve bisection of an array

1. Use the array_slice function

Using the PHP built-in function array_slice function can easily divide an array into equal parts according to a fixed number. Function. The syntax of this function is as follows:

array array_slice(array $array, int $offset, int $length = null, bool $preserve_keys = false);

Among them, the $array parameter is to be The array to be operated on, the $offset parameter is the starting offset, the $length parameter is the interception length, and the $preserve_keys parameter is whether to preserve the key name.

The following is an example code for using the array_slice function to divide an array equally:

function array_split($array, $n){
    $len = count($array);
    $per = ceil($len / $n);
    $result = array();
    for($i = 0; $i < $n; $i++){
        $start = $i * $per;
        $result[] = array_slice($array, $start, $per);
    }
    return $result;
}

The array_split function here passes in two parameters, $array is the array to be divided equally, and $n is the number to be divided equally. . $len calculates the total length of the array, and $per calculates the number of elements in each array. Then, through loop traversal, the original array is sliced ​​according to $per, stored in the result array, and returned.

2. Use the array_chunk function

Another way to bisect an array is to use the PHP built-in function array_chunk function. This function can split an array into multiple blocks according to the specified size and return a two-dimensional array.

array array_chunk(array $array, int $size, bool $preserve_keys = false);

Among them, the $array parameter is the array to be operated on, the $size parameter is the split size, $ The preserve_keys parameter is whether to preserve key names.

The following is an example code for using the array_chunk function to divide an array equally:

function array_split($array, $n){
    $size = ceil(count($array) / $n);
    return array_chunk($array, $size, true);
}

The array_split function here passes in two parameters, $array is the array to be divided equally, and $n is the number to be divided equally. . $size calculates the number of elements in each array, and then divides the array into several parts by calling the array_chunk function.

3. Application scenarios of array bisection

The application scenarios of array bisection are very wide. For example, in social network applications, a recommended content needs to be distributed equally to each user; in data analysis , a data set needs to be equally divided among several research groups for research, etc.

In actual development, we can choose different array bisection implementation methods according to specific business needs, such as using the array_slice or array_chunk function, or through loop traversal to bisection the array.

4. Conclusion

Array bisection is a very common requirement in PHP development. This article introduces the method of using array_slice and array_chunk functions to achieve array bisection, and briefly introduces the method of array bisection. Application scenarios. Developers can choose different implementation methods according to specific needs to improve development efficiency and code maintainability.

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