How can the use of underscores in attribute names affect PHP class functionality?

Using underscores in attribute names can affect PHP class functionality because PHP does not allow access to properties with underscores directly outside the class. To solve this issue, you can create getter and setter methods within the class to access and modify the attributes. 

class MyClass {
    private $my_attribute;

    public function getMyAttribute() {
        return $this->my_attribute;
    }

    public function setMyAttribute($value) {
        $this->my_attribute = $value;
    }
}

$obj = new MyClass();
$obj->setMyAttribute("value");
echo $obj->getMyAttribute(); // Output: value

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