PHP和订购带有数字和文本的数组项

Question

I'm using PHP. I have an array which has 1-256 items. Here is an example:

$arr[] = "(1.) Ben";
$arr[] = "Albert";
$arr[] = "Bill";
$arr[] = "(2.) Paul";
$arr[] = "(5.) Martin";
$arr[] = "(12.) Mike";
$arr[] = "(20.) John";

Question 1:

I would like to order the items alphabetically by names. So, the result should be this:

Albert
(1.) Ben
Bill
(20.) John
(5.) Martin
(12.) Mike
(2.) Paul

Question 2:

I also would like to order the items by 1) numbers and 2) names like this way:

(1.) Ben
(2.) Paul
(5.) Martin
(12.) Mike
(20.) John
Albert
Bill

How could I do the job with PHP?

Answer 1

It's sorting for Question 1:

<?php

$arr[] = "(1.) Ben";
$arr[] = "Albert";
$arr[] = "Bill";
$arr[] = "(2.) Paul";
$arr[] = "(5.) Martin";
$arr[] = "(12.) Mike";
$arr[] = "(20.) John";

usort($arr, function($a, $b){
    $a = explode(' ', $a, 2);
    $a = (count($a) > 1) ? $a[1] : $a[0];

    $b = explode(' ', $b, 2);
    $b = (count($b) > 1) ? $b[1] : $b[0];

    return strcmp($a, $b);
});

print_r($arr); //  // Print array sorted for 'Question 1'

@EDIT And sorting for Question 2:

$arr[] = "(1.) Ben";
$arr[] = "Albert";
$arr[] = "Bill";
$arr[] = "(2.) Paul";
$arr[] = "(5.) Martin";
$arr[] = "(12.) Mike";
$arr[] = "(20.) John";

usort($arr, function($a, $b){
    $a = explode(' ', $a, 2);
    $b = explode(' ', $b, 2);

    if(count($a) > 1 && count($b) > 1)
    {
        $a = str_replace(['(', ')', '.'], '', $a[0]);
        $b = str_replace(['(', ')', '.'], '', $b[0]);

        return $a > $b;
    }
    else
    {
        return strcmp($a[0], $b[0]);
    }
});

print_r($arr); // Print array sorted for 'Question 2'