PHP | array_multisort () Функция

Опубликовано: 24 Февраля, 2022

Array_multisort () - это встроенная функция в PHP, которая используется для одновременной сортировки нескольких массивов или многомерного массива с каждым отдельным измерением.
При использовании этой функции следует помнить, что строковые ключи будут сохранены, но числовые ключи будут повторно проиндексированы, начиная с 0 и увеличиваясь на 1.

Синтаксис:

 bool array_multisort ($ array1, sorting_order, sorting_type, $ array2 ..)

Parameters: The array generally takes one parameter that is the array which needs to be sorted. But in addition, the function can take two more optional parameters sorting_order and sorting_type.

$array1: This parameter specifies the array which we want to sort.
sorting_order: This parameter specifies the order to use i.e. in ascending or descending order. The default value of this parameter is SORT_ASC. That is, sorting in ascending order. In order to sort in descending order we will have to set this parameter to SORT_DESC.
sorting_type: This parameter specifies the sort options for the arrays and they are as follows:
- SORT_REGULAR: Compare elements regularly(Standard ASCII).
- SORT_NUMERIC: Compare elements as numeric-values.
- SORT_STRING: Compare elements as string values.
- SORT_LOCALE_STRING: Compare elements as string, based on the current locale.
- SORT_NATURAL: Compare elements as strings using “natural ordering”.
- SORT_FLAG_CASE: Can be combined (bitwise OR) with SORT_STRING or SORT_NATURAL to sort strings case-insensitively.
If we want to sort multiple arrays, we can pass them as parameters like $array2, $array3… followed by their sorting_order, sorting_type.

Return value: The array_multisort() function returns a boolean value. That is it will return TRUE on success and FALSE on failure.

Note:If two members on comparing become equal, their relative order in sorted array is undefined.

Below programs illustrate the array_multisort() function:

Program 1:

<?php
  
// Input array
$animals = array("Dog", "Cat", "Horse", 
                "Bear", "Zebra", "Lion");
  
// sorting array using default values
// for sorting_order and sorting_type    
array_multisort($animals);
          
print_r($animals);
          
?>

Output:

Array
(
    [0] => Bear
    [1] => Cat
    [2] => Dog
    [3] => Horse
    [4] => Lion
    [5] => Zebra
)

Program 2:

<?php
  
// Input arrays
$array1=array("Dog", "Cat");
$array2=array("Fido", "Missy");
  
// sorting multiple arrays using default values
// for sorting_order and sorting_type         
array_multisort($array1, $array2);
  
// printing sorted arrays         
print_r($array1);
print_r($array2);
  
?> 

Output:

Array
(
    [0] => Cat
    [1] => Dog
)
Array
(
    [0] => Missy
    [1] => Fido
)

Program 3:

<?php
  
// Input arrays
$array1=array("Dog", "Dog", "Cat");
$array2=array("Pluto", "Fido", "Missy");
  
// sorting multiple arrays       
array_multisort($array1, SORT_ASC, $array2, SORT_DESC);
  
// Printing sorted arrays       
print_r($array1);
print_r($array2);
  
?> 

Output:

Array
(
    [0] => Cat
    [1] => Dog
    [2] => Dog
)
Array
(
    [0] => Missy
    [1] => Pluto
    [2] => Fido
)

Reference:
http://php.net/manual/en/function.array-multisort.php

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PHP | array_multisort () Функция

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