Let's talk about the usage scenarios of PHP spaceship operator

                                                                                                               

PHP Spaceship Operator

Comparison Operator $a <=> $b Spaceship Operator[php7]

When $a is less than, equal to, or greater than $b, return an int value that is less than, equal to, or greater than 0 respectively.

// 示例
echo 1 <=> 1; // 0
echo 1 <=> 2; // -1
echo 2 <=> 1; // 1

Usage scenarios

Before PHP7:

$arr = [4,2,1,3];
usort($arr, function ($a, $b) {
    if ($a < $b) {
        return -1;
    } elseif ($a > $b) {
        return 1;
    } else {
        return 0;
    }
});

After PHP7 :

$arr = [4,2,1,3];

usort($arr, function ($a, $b) {
    return $a <=> $b;
});

If you have more usage scenarios, you can leave a comment.

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