Mastering PHP 7

The spaceship operator

Comparing two values is a frequent operation in any programming language. We use various language operators to express the type of comparison we wish to execute between two variables. In PHP, these operators include equal ($a == $b), identical ($a === $b), not equal ($a != $b or $a <> $b), not identical ($a !== $b), less than ($a < $b), greater than ($a > $b), less than or equal to ($a <= $b), and greater than or equal to ($a >= $b) comparisons.

All of these comparison operators result in Boolean true or false. Sometimes, however, there are cases where a three-way comparison is needed, in which case, the result of the comparison is more than just a Boolean true or false. While we can achieve a three-way comparison using ...