How can the PHP documentation for echo and print_r be helpful in resolving issues like the one described in the forum thread?

Issue: The forum thread describes a problem where the data output from a variable is not displaying correctly on the webpage. This could be due to the variable not containing the expected data or the data being formatted incorrectly. Solution: To troubleshoot this issue, you can use the PHP functions echo and print_r to output the contents of the variable to the webpage. This will help you verify the data stored in the variable and its structure. Code snippet:

```php
// Assuming $variable contains the data that needs to be displayed
echo "Variable contents: ";
print_r($variable);
```

By using the above code snippet, you can easily see the contents of the variable on the webpage and identify any issues with the data that may be causing the problem.