Introduction to how to use the array_multisort() function in the PHP function library

In the PHP function library, the array_multisort() function is a very useful function that can sort multiple arrays in a specified way. This article will introduce how to use the array_multisort() function.

1. Syntax of array_multisort() function

array_multisort ( array &$array1 [, mixed $array1_sort_order = SORT_ASC [, mixed $array1_sort_flags = SORT_REGULAR [, mixed $... [, mixed $... ]]]] ): bool

Parameter description:

1. &$array1: Required parameter, the array to be sorted.
2. $array1_sort_order: Optional parameter, the way to sort the first array. Can be SORT_ASC (ascending), SORT_DESC (descending), or empty (to use the default sort order).
3. $array1_sort_flags: Optional parameter, the sorting type used when sorting the first array. Can be SORT_REGULAR, SORT_NUMERIC or SORT_STRING.
4. $... Optional parameter, other arrays to be sorted.

2. Example to demonstrate the use of array_multisort() function

Suppose we want to sort the two arrays of "name" and "age" according to the "score" of the students. We can use the following code:

$names = array('Tom', 'Jack', 'Mike', 'John');
$ages = array('25', '18', '20', '22');
$scores = array('80', '60', '70', '90');
array_multisort($scores, SORT_DESC, SORT_NUMERIC, $names, $ages);

1. Description:

In the above code, we first define 3 arrays: $names, $ages and $scores.

Then, we called the array_multisort() function to sort the $scores array (here we used the SORT_DESC sorting method), and also passed the $names and $ages arrays to the array_multisort() function so that they Sort according to the sort order of the $scores array.

Note: We also use the SORT_NUMERIC parameter to specify the sorting type of the $scores array.

2. Execution results:

After executing the above code, we can get the following results:

Array
(
    [0] => John
    [1] => Tom
    [2] => Mike
    [3] => Jack
)
Array
(
    [0] => 22
    [1] => 25
    [2] => 20
    [3] => 18
)

The analysis results show that the score ranking of $scores is : 90, 80, 70, 60. The corresponding names and ages are: John (22 years old), Tom (25 years old), Mike (20 years old), Jack (18 years old).

3. Summary

Through the above example, we can see that the array_multisort() function is a very convenient function that allows us to easily sort multiple arrays. Let us Be more efficient and convenient at work. When using it, we also need to pay attention to how the parameters are used to avoid errors.

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