PHP：对数字排序后的数字排序

I have an array of values that I'd like to sort alphabetically, but with numbers sorted after characters.

For instance, given the following strings:

Core 2 Duo, Core Duo, Core Quad, Core 4 Quad

I'd like it to end up ordered as so:

Core Duo, Core 2 Duo, Core Quad, Core 4 Quad

Instead, PHP's sort() function sorts it like this:

Core 2 Duo, Core 4 Quad, Core Duo, Core Quad

Natural sorting returns the same results as regular sorting.

So is there any way to tell PHP something like, "If you encounter a number, sort it as if it comes after Z"?

It seems that what you're after is a function that pushes all numeric elements of your strings to the back, e.g. "Core 2 Duo" => "Core Duo 2".

// moves numeric parts of the string to the back
function transform($s)
{
        $parts = explode(' ', $s);
        foreach (array_filter($parts, 'is_numeric') as $key => $value) {
                unset($parts[$key]);
                $parts[] = $value;
        }
        return join(' ', $parts);
}

// natural sort on transformed strings
function cmp($a, $b)
{
    return strnatcmp(transform($a), transform($b));
}

$a = array('Core 2 Duo', 'Core Duo', 'Core Quad', 'Core 2 Quad');

usort($a, 'cmp');

print_r($a);

Here is your solution:

<?php

$array = array('Core 2 Duo', 'Core Duo', 'Core Quad', 'Core 4 Quad');

$tempArray = array();
foreach($array as $key=>$value) {
    $exp = explode(" ",$value); 
    if(count($exp)==3) {
        $tempArray[$key] = $exp[0]." ".$exp[2]." ".$exp[1];
    } else {
        $tempArray[$key] = $exp[0]." ".$exp[1]." "."-1";
    }
}

asort($tempArray);

$sortedArray = array();
foreach($tempArray as $key=>$value) {
    $sortedArray[] = $array[$key];
}

print_r($sortedArray);

?>

Output:

Array
(
    [0] => Core Duo
    [1] => Core 2 Duo
    [2] => Core Quad
    [3] => Core 4 Quad
)