PHP has doubts about assigning values ​​to class attributes

Test code:

<code><span><span><?php</span><span>$a</span> = <span>new</span> controller;
<span>$a</span>->test();

<span><span>class</span><span>controller</span>{</span><span>public</span><span>$menuList</span> = time();
    <span>public</span><span><span>function</span><span>test</span><span>()</span>{</span><span>echo</span><span>$this</span>->menuList;
    }
}
<span>?></span></span></span></code>

This will report an error, why

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The above introduces PHP’s doubts about class attribute assignment, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.