Swap two variable values ​​in PHP

PHP has two methods to implement the exchange of two variable values. The first method uses a third temporary variable. The second method is to swap the values ​​of two variables without using the third variable.

Below we will introduce to you the PHP method of exchanging two variable values through specific code examples.

First of all, everyone must know that exchanging two variables means exchanging the values ​​of variables. Typically this is done via data in memory.

Method 1: The easiest way to swap two variables is to use a third temporary variable

<?php
$a = 15;
$b = 27;

// 交换逻辑

echo "<br>交换前的数字为:<br>";
echo "a =".$a." 且 b=".$b;

$temp = $a;
$a = $b;
$b = $temp;

echo "<br>交换后的数字为: <br>";
echo "a =".$a." 且 b=".$b."<br>";

Output:

交换前的数字为:
a =15 且 b=27
交换后的数字为: 
a =27 且 b=15

Method Two : Swap two variable values ​​without using the third variable

<?php
$a = 15;
$b = 27;
echo "<br>交换前：  ". $a . &#39;,&#39; . $b;
list($a, $b) = array($b, $a);
echo "<br>交换后：  ". $a . &#39;,&#39; . $b."<br>";

Output:

交换前： 15,27
交换后： 27,15

Note:

list() function means assigning the values ​​in the array to a set of variables

list ( mixed $var1 [, mixed $... ] ) : array

Like array(), this is not a real function, but a language structure. list() can assign values ​​to a set of variables in a single operation.

Parameter var1 represents a variable. The return value is the specified array.

This article is an introduction to two methods of exchanging two variable values ​​​​in PHP. It is simple and easy to understand. I hope it will be helpful to friends in need!

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