Implementation method of sorting array values ​​by size in PHP

How to implement PHP array value sorting by size

In PHP, sorting arrays is a very common operation. If you want to sort the values ​​of an array by size, you can use PHP's built-in functions to achieve this. The following will show two commonly used methods to sort array values ​​by size, namely using the sort() function and using the custom sorting function usort().

Using the sort() function

The sort() function is a built-in function in PHP that sorts arrays. It directly modifies the original array. The following is a simple example:

$array = array(4, 2, 8, 5, 1);
sort($array);
print_r($array);

Run the above code, it will output:

Array
(
    [0] => 1
    [1] => 2
    [2] => 4
    [3] => 5
    [4] => 8
)

Use usort() function

If you want to customize the sorting rules, you can use usort ()function. Here is an example, sorting by value size:

$array = array(4, 2, 8, 5, 1);
usort($array, function($a, $b) {
    return $a - $b;
});
print_r($array);

Running the above code will output the same results as above.

Conclusion

Both of the above methods can achieve the function of sorting PHP array values ​​by size. The specific choice depends on the needs. It is simpler to use the sort() function, while custom sorting rules can be implemented using the usort() function.

I hope the above content will be helpful to you. If you have any questions or more questions, please leave a message to communicate!

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