以子字符串为标识符的PHP排序字符串数组

function compareStrings($str1, $str2, $subStr) {
    $pos1 = strpos($str1, $subStr);
    $pos2 = strpos($str2, $subStr);
    
    if ($pos1 === false && $pos2 === false) {
        return 0;
    } elseif ($pos1 === false) {
        return 1;
    } elseif ($pos2 === false) {
        return -1;
    } else {
        return $pos1 - $pos2;
    }
}

$array = ["apple", "banana", "orange", "grape"];
$subStr = "an";

usort($array, function($str1, $str2) use ($subStr) {
    return compareStrings($str1, $str2, $subStr);
});

print_r($array);