Are there any specific pitfalls to be aware of when concatenating strings in PHP classes?

When concatenating strings in PHP classes, one common pitfall to be aware of is the use of the concatenation operator "." within the class properties or methods. This can lead to unexpected behavior or errors if the concatenation is not done correctly. To avoid this issue, it is recommended to use string interpolation or concatenation within the class methods instead of directly within the class properties.

class ExampleClass {
    private $firstName = 'John';
    private $lastName = 'Doe';

    public function getFullName() {
        return "{$this->firstName} {$this->lastName}";
    }
}

$example = new ExampleClass();
echo $example->getFullName(); // Output: John Doe