PHP Array function array_multisort () Usage example analysis, arraymultisort_php tutorial

PHP Array function array_multisort () Usage example analysis, Arraymultisort

This paper analyzes the usage of PHP array function array_multisort (). Share to everyone for your reference, as follows:

Sometimes we need to sort the values of a key in a two-dimensional array, and this is where we discuss the problem. We can use the Array_multisort () function. The Array_multisort () function sorts multiple arrays or multidimensional arrays.

The array in the parameter is treated as a column of a table and sorted by rows-this is similar to the function of the SQL ORDER by clause. The first array is the primary array to sort. If the rows (values) in the array are the same, they are sorted according to the size of the corresponding values in the next input array, and so on.

The first parameter is an array, and each subsequent argument may be an array, or it may be one of the following sort order flags (the sort flags are used to change the default order):

SORT_ASC-By default, in ascending order. (A-Z)
Sort_desc-sorted in descending order. (Z-A)

You can then specify the sort type:

Sort_regular-Default. Arranges each item in a regular order.
Sort_numeric-Sorts each item in numerical order.
Sort_string-Arranges each item alphabetically.

Syntax: Array_multisort (array1,sorting order,sorting type,array2,array3 ...)

Array1: Required. Specifies the input array.
Sorting order: Optional. Specify the order of arrangement. The possible values are SORT_ASC and Sort_desc.
Sorting type: Optional. Specifies the sort type. The possible values are Sort_regular, Sort_numeric, and sort_string.
Array2: Optional. Specifies the input array.
ARRAY3: Optional. Specifies the input array.

The string key name is preserved, but the number key is re-indexed, starting at 0 and incrementing by 1. You can set the sort order and sort type after each array. If not set, the default value is used for each array parameter.

Here is an example:

<?php $arr = "; Echo ' Two-dimensional array is as follows: '. '
'; for ($i =0; $i <=5; $i + +) {$arr [$i] [' val '] = Mt_rand (1, +); $arr [$i] [' num '] = Mt_rand (1);} Echo '
'; Print_r ($arr); Echo '
'; Echo ' Extracts the key from the two-dimensional array to Val, which is separated into another array: '. '
'; foreach ($arr as $key = + $row)  {   $vals [$key] = $row [' Val '];    $nums [$key] = $row [' num ']; } Echo '
'; Print_r ($vals); Echo '
'; Echo ' Sorts it: '. '
'; Array_multisort ($vals, SORT_ASC, $arr); Echo '
'; Print_r ($vals); Echo '
';? >

Operation Result:

The two-dimensional array is as follows: Array (  [0] = = Array (      [val] = [      num] = +    )  [1] = = Array    (      [Val ] = 8      [num] = [  2] = = Array    (      [val] = Notoginseng      [num] = 3    )  [3] =&G T Array    (      [val] = [      num] = [  4] = = Array    (      [val] = [      num]  [5] = = Array    (      [val] =      [num] = Notoginseng)    ) extracts the key from a two-dimensional array to Val, Separate into another array: array (  [0] = [  1] = 8  [2] = [  3] = [  4] =  [5] = 30 ) to sort it: Array (  [0] = 8  [1] = [2] = [3] = [  4] = [  5] + [+] = 46)

So we'll get a two-dimensional array sorted by Val Ascending.

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I hope this article is helpful to you in PHP programming.

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