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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 2537 | $allowed_zones = timezone_identifiers_list(); |
| 2538 | if ( ! in_array( $value, $allowed_zones ) && ! empty( $value ) ) { |
| 2539 | $value = get_option( $option ); // Resets option to stored value in the case of failed sanitization |
| 2540 | if ( function_exists('add_settings_error') ) |
| 2541 | add_settings_error('timezone_string', 'invalid_timezone_string', __('The timezone you have entered is not valid. Please select a valid timezone.') ); |
| 2542 | } |
| 2543 | break; |
| 2544 | |
| 2545 | default : |
| 2546 | $value = apply_filters("sanitize_option_{$option}", $value, $option); |
| 2547 | break; |
| 2548 | } |
| 2549 | |
| 2550 | return $value; |
| 2551 | } |
| 2552 | |
| 2553 | /** |
| 2554 | * Parses a string into variables to be stored in an array. |
| 2555 | * |