How to sort arrays with the asort() function in PHP

The

asort() function sorts the array based on element values; it sorts in a way that maintains the relationship between index and value. The following article will show you how to use the asort() function. I hope it will be helpful to you.

asort() function

asort() function is a built-in function in PHP , which by default sorts elements in ascending order of value.

Basic syntax:

asort($array,$sorting_type);

Parameter description:

$array parameter: required parameter, used to specify the order to be sorted array.

$sorting_type parameter: Optional parameter, used to specify how to arrange the elements of the array; there are different sorting types.

The following are the possible sorting types:

• 1. SORT_REGULAR: Default value, arrange each element in regular order (Standard ASCII, do not change the type).

• 2. SORT_NUMERIC: Indicates comparing elements numerically.

• 3. SORT_STRING: Indicates comparing elements as strings.

• 4. SORT_LOCALE_STRING: Indicates that each item is processed as a string, based on the current locale (can be changed through setlocale()).

• 5. SORT_NATURAL: Indicates processing each item as a string, using natural sorting similar to natsort().

• 6. SORT_FLAG_CASE: Indicates that strings can be sorted by combining (bitwise OR) SORT_STRING or SORT_NATURAL, case-insensitively.

Return value: This function returns True when successful and False when failed.

Usage of asort() function

The following is a simple code example to introduce the use of asort() function

Example 1: Sort strings

<?php 
$arr = array("0" => "PHP", 
        "1" => "HTML/HTML5", 
        "2" => "CSS/CSS3", 
        "3" => "JavaScript", 
        "4" => "jQuery", 
        "5" => "Bootstrap", 
        "6" => "Python", 
     ); 
  
// asort()的实现
asort($arr); 
// 遍历输出排序后的数组
foreach ($arr as $key => $val) { 
    echo "[$key] = $val"; 
    echo"<br>"; 
}
?>

Output:

Example 2: Sort numbers

<?php 
$arr = array("a" => 11, 
            "b" => -22, 
            "d" => 33, 
            "n" => 4, 
            "o" => 55, 
            "p" => 1000, 
            "r" => 0, 
                              
        );
  
// asort()的实现
asort($arr); 
// 遍历输出排序后的数组
foreach ($arr as $key => $val) { 
    echo "[$key] = $val"; 
    echo"<br>"; 
}
?>

Output:

The above is the entire content of this article, I hope it will be helpful to everyone's learning. For more exciting content, you can pay attention to the relevant tutorial columns of the PHP Chinese website! ! !

The above is the detailed content of How to sort arrays with the asort() function in PHP. For more information, please follow other related articles on the PHP Chinese website!