PHP 7 | Spaceship Operator
Last Updated :
21 Jun, 2019
This article will make you aware of a very useful operator i.e the spaceship operator PHP 7. The spaceship operator or combined comparison operator is denoted by “<=>“. This is a three-way comparison operator and it can perform greater than, less than and equal comparison between two operands.
This operator has similar behavior like strcmp() or version_compare(). This operator can be used with integers, floats, strings, arrays, objects, etc.
This <=> operator offers combined comparison :
- Return 0 if values on either side are equal
- Return 1 if value on the left is greater
- Return -1 if the value on the right is greater
Example:
// Comparing Integers
echo 1 <=> 1; // outputs 0
echo 3 <=> 4; // outputs -1
echo 4 <=> 3; // outputs 1
// String Comparison
echo "a" <=> "a"; // outputs 0
echo "m" <=> "y"; // outputs -1
echo "y" <=> "c"; // outputs 1
<?php
echo "Integers \n" ;
echo 7 <=> 7 ;
echo "\n" ;
echo 7 <=> 6;
echo "\n" ;
echo 6 <=> 7;
echo "\nFloat\n" ;
echo 2.5 <=> 1.5;
echo "\n" ;
echo 0.5 <=> 1.5;
echo "\n" ;
echo 1.5 <=> 1.5;
echo "\nStrings\n" ;
echo "a" <=> "a" ;
echo "\n" ;
echo "g" <=> "b" ;
echo "\n" ;
echo "a" <=> "b" ;
echo "\nArrays\n" ;
echo [] <=> [];
echo "\n" ;
echo [1, 7, 3] <=> [1, 7, 3];
echo "\n" ;
echo [1, 7, 3, 5] <=> [1, 7, 3];
echo "\n" ;
echo [1, 7, 3] <=> [4, 4, 4];
echo "\n" ;
?>
|
Output:
Integers
0
1
-1
Float
1
-1
0
Strings
0
1
-1
Arrays
0
0
1
-1
Reference:http://php.net/manual/en/language.operators.comparison.php
Like Article
Suggest improvement
Share your thoughts in the comments
Please Login to comment...