PHP array_multisort() Function
Last Updated :
20 Jun, 2023
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The array_multisort() is an inbuilt function in PHP which is used to sort multiple arrays at once or a multi-dimensional array with each individual dimension.
With this function, one should remember that string keys will be maintained, but numeric keys will be re-indexed, starting at 0 and increases by 1.
Syntax:
php
Output:
php
Output:
php
Output:
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.
<?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);
?>
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);
?>
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);
?>
Array
(
[0] => Cat
[1] => Dog
[2] => Dog
)
Array
(
[0] => Missy
[1] => Pluto
[2] => Fido
)
Reference:
http://php.net/manual/en/function.array-multisort.php
