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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 | * |