Why are different results shown?
<?php
//Declare a variable $iphone whose value is a string phone
$iphone = 'Mobile phone';
//unset destroy Remove a variable unset($iphone);
var_dump($iphone);
?>
The result in the web page is displayed as string(6) "mobile phone"
The actual result of the operation is string(4) "mobile phone"
What is the reason for the extra two character length
