What are the potential drawbacks of attempting to close a resource that has not been opened within an interface?

Attempting to close a resource that has not been opened within an interface can lead to errors or unexpected behavior in your code. To solve this issue, you should always check if the resource is valid before attempting to close it within the interface implementation. 

interface ResourceInterface {
    public function openResource();
    public function closeResource();
}

class ResourceManager implements ResourceInterface {
    private $resource;

    public function openResource() {
        $this->resource = fopen('example.txt', 'r');
    }

    public function closeResource() {
        if ($this->resource) {
            fclose($this->resource);
        }
    }
}

Keywords

resource close interface error PHP

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