What are some best practices for assigning objects as variables in PHP?

When assigning objects as variables in PHP, it is important to use the correct syntax and ensure that the object is properly instantiated before assigning it to a variable. It is also a good practice to check if the object exists before attempting to assign it to a variable to avoid any potential errors.

// Instantiate an object
$object = new ClassName();

// Check if the object exists before assigning it to a variable
if ($object instanceof ClassName) {
    $variable = $object;
} else {
    // Handle the case where the object does not exist
    $variable = null;
}