How to use the combined comparison operator (<=>) in PHP7? (code example)

The combined comparison operator () is a very useful operator. This article will show you how to use the combined comparison operator (). I hope it will be useful to you. help.

Combined comparison operator ()

PHP tutorial]

$c = $a <=> $b;
// 这相当于
$c = ($a < $b) ? -1 : (($a > $b) ? 1 : 0);

Explanation: <=>The operator behaves like strcmp( ) or version_compare(); it can be used with integers, floats, strings, arrays, objects, etc.

<=> The combined comparison provided by the operator:

Code example

Example 1: Integer comparison

<?php 
echo"整数 <br>"; 
echo 7 <=> 7 ; 
echo"<br>"; 
echo 7 <=> 6; 
echo"<br>"; 
echo 6 <=> 7; 
?>

) in PHP7? (code example)" >) in PHP7? (code example)" title="155020218194702How to use the combined comparison operator (<=>) in PHP7? (code example)" alt="How to use the combined comparison operator (<=>) in PHP7? (code example)"/>

Example 2: Floating point number Comparison

<?php 
echo"浮点数<br>"; 
  
echo 2.5 <=> 1.5;  
echo"<br>"; 
echo 0.5 <=> 1.5;  
echo"<br>"; 
echo 1.5 <=> 1.5;  
?>

) in PHP7? (code example)" >) in PHP7? (code example)" title="155020219694011How to use the combined comparison operator (<=>) in PHP7? (code example)" alt="How to use the combined comparison operator (<=>) in PHP7? (code example)"/>

Example 3: String comparison

<?php 
echo"<br>字符串<br>"; 
echo "a" <=> "a" ; 
echo"<br>"; 
echo "g" <=> "b" ;  
echo"<br>"; 
echo "a" <=> "b" ;  
echo"<br>"; 
echo "A" <=> "B" ;  
echo"<br>"; 
echo "a" <=> "B" ;  
echo"<br>"; 
echo "2" <=> "1" ;  
echo"<br>"; 
echo "2" <=> "a" ;  
echo"<br>"; 
echo "2" <=> "A" ;  
?>

Example 4: Array comparison

<?php 
echo"<br>数组<br>"; 
echo [] <=> [];  
echo"<br>"; 
echo [1, 7, 3] <=> [1, 7, 3]; 
echo"<br>"; 
echo [1, 7, 3, 5] <=> [1, 7, 3]; 
echo"<br>"; 
echo [1, 7, 3] <=> [4, 4, 4]; 
echo"<br>"; 
?>

The above is the detailed content of How to use the combined comparison operator (<=>) in PHP7? (code example). For more information, please follow other related articles on the PHP Chinese website!