PHP Functions For Sorting Arrays
In the previous chapter you’ve learnt the essentials of PHP arrays i.e. what arrays are, how to create them, how to view their structure, how to access their elements etc. You can do even more things with arrays like sorting the elements in any order you like.
PHP comes with a number of built-in functions designed specifically for sorting array elements in different ways like alphabetically or numerically in ascending or descending order. Here we’ll explore some of these functions most commonly used for sorting arrays.
sort()andrsort()— For sorting indexed arraysasort()andarsort()— For sorting associative arrays by valueksort()andkrsort()— For sorting associative arrays by key
Sorting Indexed Arrays in Ascending Order
The sort() function is used for sorting the elements of the indexed array in ascending order (alphabetically for letters and numerically for numbers).
Example:
This print_r() statement gives the following output:
Array ( [0] => Blue [1] => Green [2] => Red [3] => Yellow )
Similarly you can sort the numeric elements of the array in ascending order.
Example:-
This print_r() statement gives the following output:
Array ( [0] => 1 [1] => 2 [2] => 2.5 [3] => 4 [4] => 7 [5] => 10 )
Sorting Indexed Arrays in Descending Order
The rsort() function is used for sorting the elements of the indexed array in descending order (alphabetically for letters and numerically for numbers).
Example:-
This print_r() statement gives the following output:
Array ( [0] => Yellow [1] => Red [2] => Green [3] => Blue )
Similarly, you can sort the numeric elements of the array in descending order.
Example
This print_r() statement gives the following output:
Array ( [0] => 10 [1] => 7 [2] => 4 [3] => 2.5 [4] => 2 [5] => 1 )
Sorting Associative Arrays in Ascending Order By Value
The asort() function sorts the elements of an associative array in ascending order according to the value. It works just like sort(), but it preserves the association between keys and its values while sorting.
Example:-
This print_r() statement gives the following output:
Array ( [Harry] => 14 [Peter] => 20 [Clark] => 35 [John] => 45 )
Sorting Associative Arrays in Descending Order By Value
The arsort() function sorts the elements of an associative array in descending order according to the value. It works just like rsort(), but it preserves the association between keys and its values while sorting.
Example:-
This print_r() statement gives the following output:
Array ( [John] => 45 [Clark] => 35 [Peter] => 20 [Harry] => 14 )
Sorting Associative Arrays in Ascending Order By Key
The ksort() function sorts the elements of an associative array in ascending order by their keys. It preserves the association between keys and its values while sorting, same as asort() function.
Example:-
This print_r() statement gives the following output:
Array ( [Clark] => 35 [Harry] => 14 [John] => 45 [Peter] => 20 )
Sorting Associative Arrays in Descending Order By Key
The krsort() function sorts the elements of an associative array in descending order by their keys. It preserves the association between keys and its values while sorting, same as arsort() function.
Example:-
This print_r() statement gives the following output:
Array ( [Peter] => 20 [John] => 45 [Harry] => 14 [Clark] => 35 )
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