typecho - html and php mixed problem

The above code is the template page of typecho, which is a mixed page of html and php. The php code contains this, which is quite strange. I don’t see where the class this comes from in this code. What is the syntax of this? Also, I see many sections of PHP code on this page. Can each section be regarded as a whole section? For example, if you define the variable a in one section and then get the value in another PHP block, right? Forgot to contact me

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The above code is the template page of typecho, which is a mixed page of html and php. The php code contains this, which is quite strange. I don’t see where the class this comes from in this code. What is the syntax of this? Also, I see many sections of PHP code on this page. Can each section be regarded as a whole section? For example, if you define the variable a in one section and then get the value in another PHP block, right? Forgot to contact me

$this represents its own object;
$this->$name uses the content of $name as the attribute name of the object. To access object attributes
For example, first specify $name='address';
$this->$ name is equivalent to $this->address

This usually points to the application or framework kernel

<code><?php 
class App
{
    public function view($template, $return = true) 
    {
        ob_start();
        include $template;
        $content = ob_get_contents();
        if ($return) {
            return $content;
        } else {
            echo $content;
        }
    }
}
</code>

When the controller displays the template, it is usually called

<code>$this->view('模板地址');</code>

And $this in this template points to the instance of the app class

In the php file, code other than can be regarded as echoing a string, and the scope of each piece of code is not independent

<code><?php 

$test = 'hello!world';
?>

html代码

<?php 
echo $test; //显示hello!world
?></code>