What potential pitfalls can occur when defining variables within a PHP constructor and accessing them in other class functions?

When defining variables within a PHP constructor and accessing them in other class functions, a potential pitfall is that the variables may not be accessible outside of the constructor scope due to variable visibility. To solve this issue, you can declare the variables as class properties to make them accessible throughout the class. 

class MyClass {
    private $variable;

    public function __construct($value) {
        $this->variable = $value;
    }

    public function getVariable() {
        return $this->variable;
    }
}

$obj = new MyClass('Hello');
echo $obj->getVariable(); // Output: Hello

Keywords

PHP constructor class functions variable scope variable visibility object-oriented programming

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