How to exchange the values ​​of two variables in php without using a third variable

Method: 1. Use the statement "$a=$a^$b;$b=$b^$a;$a=$a^$b;"; 2. Use $b=explode( "|",$a."|".$b);$a=$b[1];$b=$b[0];" statement; 3. Use "list($b,$a)=array ($a,$b);".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php does not use a third variable to exchange the values ​​of two variables

Method 1: Use XOR operation

<?php
header("Content-type:text/html;charset=utf-8");
$a=125;
$b=854;
echo &#39;交换前 :<br />&#39;;
echo $a."<br>";
echo $b."<br>";

$a=$a^$b;
$b=$b^$a;
$a=$a^$b;
echo &#39;<br>交换后 :<br />&#39;;
echo $a."<br>";
echo $b;
?>

Output result:

##Method 2:

<?php
header("Content-type:text/html;charset=utf-8");
$a=12;
$b=85;
echo &#39;交换前 :<br />&#39;;
echo $a."<br>";
echo $b."<br>";

$b=explode("|", $a."|".$b);
$a=$b[1];
$b=$b[0];
echo &#39;<br>交换后 :<br />&#39;;
echo $a."<br>";
echo $b;
?>

Output result:

Method 3:

<?php
header("Content-type:text/html;charset=utf-8");
$a=126;
$b=85;
echo &#39;交换前 :<br />&#39;;
echo $a."<br>";
echo $b."<br>";

list($b,$a)=array($a,$b);
echo &#39;<br>交换后 :<br />&#39;;
echo $a."<br>";
echo $b;
?>

Output result:

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