How to use spaceship operator in PHP7

1.Definition

Spaceship operator is also called combination comparison operatororcombination comparison operator, which is represented by the symbol <=>, this operator can be used to compare two variables (not limited to numeric type data).

2. Expression

$c= $a <=> $b;

• If $a > $b, then the value of $c is 1;

• If $a == $b, then the value of $c is 0;

• If $a < $b, then the value of $c is - 1;

3. Notes

The spaceship operator is a new feature introduced in PHP7 . ##PHP7 , it is used to compare two expressions: when the first expression is less than, equal to or greater than the second expression, the value it returns is: -1, 0 or 1.

4. Usage examples

<?php
   //整型比较
   print( 1 <=> 1);print("<br/>");                    //0
   print( 1 <=> 2);print("<br/>");                    //-1
   print( 2 <=> 1);print("<br/>");                    //1
   print("<br/>");
   //字符型比较
   print( 1.5 <=> 1.5);print("<br/>");//0
   print( 1.5 <=> 2.5);print("<br/>");//-1
   print( 2.5 <=> 1.5);print("<br/>");//1
   print("<br/>");
   //字符型
   print( "a" <=> "a");print("<br/>");//0
   print( "a" <=> "b");print("<br/>");//-1
   print( "b" <=> "a");print("<br/>");//1
?>

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