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Override defaults with options (PHP associative arrays)

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Take an associative array of options and their default settings. Remove entries of options that do not exist in the default options. Return a safely filtered and overridden array of options.

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  1. <?php
  2. extract(
  3. 	array_intersect_key(
  4. 		array_merge(
  5. 			$defaults = array (
  6. 				'default' => 'options',
  7. 				'and' => 'values',
  8. 				'go' => 'here',
  9. 				'required' => true,
  10. 				'filter_function' => null,
  11. 				'error_string' => 'An error occurred: %s'
  12. 			),
  13. 			$options
  14. 		),
  15. 		$defaults
  16. 	)
  17. );
  18.  
  19. // Function Version
  20.  
  21. /**
  22.  * Takes an associative array of options and their default settings.
  23.  * Removes entries of options that do not exist in the defaults.
  24.  * Returns an array of options with the defaults where options do not
  25.  * override the defaults.
  26.  * @param array $options The user's options
  27.  * @param array $defaults The default options
  28.  * @return array The filtered and overridden options
  29.  */
  30. function safe_options ($options, $defaults) {
  31. 	return array_intersect_key(array_merge($defaults, $options), $defaults);
  32. }
  33.  
  34. extract(safe_options(
  35. 	$options,
  36. 	array (
  37. 		'default' => 'options',
  38. 		'and' => 'values',
  39. 		'go' => 'here',
  40. 		'required' => true,
  41. 		'filter_function' => null,
  42. 		'error_string' => 'An error occurred: %s'
  43. 	)
  44. ));
  45. print $default.$and.$go.$required.$filter_function.$error_string;
  46. ?>

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