[Solved] You want to ensure a file is always closed when your PHP object is destroyed. Which code snippet correctly uses a destructor to do this?class FileHandler { private $file;... | PHP

PHP - Classes and Objects

You want to ensure a file is always closed when your PHP object is destroyed. Which code snippet correctly uses a destructor to do this?

class FileHandler {
  private $file;
  function __construct($filename) {
    $this->file = fopen($filename, 'w');
  }
  // What goes here?
}

Afunction __destruct() { open($this->file); }

Bfunction __destruct() { fclose($this->file); }

Cfunction __destruct() { fclose($filename); }

Dfunction __destruct() { $this->file = null; }

Step-by-Step Solution

Solution:

Step 1: Understand resource cleanup in destructor
The destructor should close the file resource held in $this->file using fclose().
Step 2: Check each option for correctness
function __destruct() { fclose($this->file); } correctly calls fclose($this->file);. function __destruct() { open($this->file); } tries to open instead of close. function __destruct() { fclose($filename); } uses undefined $filename. function __destruct() { $this->file = null; } just sets property to null without closing.
Final Answer:
function __destruct() { fclose($this->file); } -> Option B
Quick Check:
Destructor closes file resource properly [OK]

Quick Trick: Destructor should close resources like files with fclose() [OK]

Common Mistakes:

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You want to ensure a file is always closed when your PHP object is destroyed. Which code snippet correctly uses a destructor to do this?