Wednesday, May 29, 2019
What is (the 'Spaceship' Operator) in PHP 7?
Answer
Answer
PHP 7, which will come out in November this year will introduce the Spaceship (<=>) operator. What is it and how does it work?
This question already has an answer in our general reference question about PHP operators.
Answer
The <=> ("Spaceship") operator will offer combined comparison in that it will :
Return 0 if values on either side are equal
Return 1 if the value on the left is greater
Return -1 if the value on the right is greater
The rules used by the combined comparison operator are the same as the currently used comparison operators by PHP viz. <, <=, ==, >= and >. Those who are from Perl or Ruby programming background may already be familiar with this new operator proposed for PHP7.
//Comparing Integers
echo 1 <=> 1; //output 0
echo 3 <=> 4; //output -1
echo 4 <=> 3; //output 1
//String Comparison
echo "x" <=> "x"; //output 0
echo "x" <=> "y"; //output -1
echo "y" <=> "x"; //output 1
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