How to use unset to clear variables in php

How to use unset to clear variables in php?

How to destroy variables through unset() in php:

Declare a string and print it

The preview effect is as shown

unset destroys the variable and Output

The preview effect is as shown in the figure, the variables are destroyed and there is no output

Define multiple variables and print

The preview effect is as shown

Destroy multiple variables at the same time and print

The preview effect is empty

Source code is attached

<?php
//php通过unset()销毁变量
$name=&#39;konhq&#39;;
unset($name);
echo $name;
$a=$b=$name=&#39;konhq&#39;;
unset($a,$b,$name);
var_dump($a,$b,$name);
?>

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