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How to exchange the values of two variables in php without using a third variable
- 青灯夜游Original
- 2021-09-30 16:25:332292browse
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 '交换前 :<br />';
echo $a."<br>";
echo $b."<br>";
$a=$a^$b;
$b=$b^$a;
$a=$a^$b;
echo '<br>交换后 :<br />';
echo $a."<br>";
echo $b;
?> Output result:
##Method 2:
<?php
header("Content-type:text/html;charset=utf-8");
$a=12;
$b=85;
echo '交换前 :<br />';
echo $a."<br>";
echo $b."<br>";
$b=explode("|", $a."|".$b);
$a=$b[1];
$b=$b[0];
echo '<br>交换后 :<br />';
echo $a."<br>";
echo $b;
?> Output result:
Method 3:
<?php
header("Content-type:text/html;charset=utf-8");
$a=126;
$b=85;
echo '交换前 :<br />';
echo $a."<br>";
echo $b."<br>";
list($b,$a)=array($a,$b);
echo '<br>交换后 :<br />';
echo $a."<br>";
echo $b;
?>Output result:
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