Tác dụng của hàm asort()
The asort() function sorts an associative array in ascending order, according to the value.
The keys are preserved, i.e. the key-to-value mapping will remain unchanged by the sort operation.
The following table summarizes the technical details of this function.
| Return Value: | Returns TRUE on success or FALSE on failure. |
|---|---|
| Version: | PHP 4+ |
Syntax
The basic syntax of the asort() function is given with:
The following example shows the asort() function in action.
Example
Run this code »<?php
// Sample array
$alphabets = array("b"=>"ball", "d"=>"dog", "a"=>"apple", "c"=>"cat");
// Sorting alphabets array
asort($alphabets);
print_r($alphabets);
?>Tip: The asort() and arsort() functions mainly used for sorting associative arrays by value, whereas ksort() and krsort() functions used for sorting associative arrays by key.
Parameters
The asort() function accepts the following parameters.
| Parameter | Description |
|---|---|
| array | Required. Specifies the array to sort. |
| sort_flags |
Optional. Specifies how array items should be compared. Possible values are:
|
More Examples
Here're some more examples showing how asort() function actually works:
The following example sorts an associative array having numeric values in ascending order:
Example
Run this code »<?php
// Sample array
$persons = array("Harry"=>18, "Clark"=>32, "Peter"=>20, "John"=>24);
// Sorting persons array
asort($persons);
print_r($persons);
?>