How to exchange the values ​​of two variables in PHP without using the third parameter

Method: 1. Use "$a=$a $b;$b=$a-$b;$a=$a-$b;" to achieve exchange; 2. Use "list($ b,$a)=array($a,$b);” to exchange; 3. Use the string splitting function explode provided in PHP to implement the exchange.

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

No need to Three variables exchange the values ​​of two variables

Method 1:

<?php
header("Content-type:text/html;charset=utf-8");
$a=333;
$b=444;
$a=$a+$b;
$b=$a-$b;
$a=$a-$b;
echo $a."<br>";
echo $b;
?>

Output result:

Method 2:

<?php
$a=333;
$b=444;
list($b,$a)=array($a,$b);
echo $a."<br>";
echo $b;
?>

Output result:

Method 3: Let’s use PHP The provided string splitting function explode is implemented.

<?php
$a=333;
$b=444;
$b=explode("|", $a."|".$b);
var_dump($b);
$a=$b[1];
$b=$b[0];
echo $a."<br>";
echo $b;
?>

Output result:

Recommended learning: "PHP Video Tutorial"

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