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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.
This hook occurs 3 times in this file.
| Line | Code |
|---|---|
| 57 | * Filter the default value for an option. |
| 58 | * |
| 59 | * The dynamic portion of the hook name, `$option`, refers to the option name. |
| 60 | * |
| 61 | * @since 3.4.0 |
| 62 | * |
| 63 | * @param mixed $default The default value to return if the option does not exist |
| 64 | * in the database. |
| 65 | */ |
| 66 | return apply_filters( 'default_option_' . $option, $default ); |
| 67 | } |
| 68 | |
| 69 | $alloptions = wp_load_alloptions(); |
| 70 | |
| 71 | if ( isset( $alloptions[$option] ) ) { |
| 72 | $value = $alloptions[$option]; |
| 73 | } else { |
| 74 | $value = wp_cache_get( $option, 'options' ); |
| 75 | |
| Line | Code |
| 79 | // Has to be get_row instead of get_var because of funkiness with 0, false, null values |
| 80 | if ( is_object( $row ) ) { |
| 81 | $value = $row->option_value; |
| 82 | wp_cache_add( $option, $value, 'options' ); |
| 83 | } else { // option does not exist, so we must cache its non-existence |
| 84 | $notoptions[$option] = true; |
| 85 | wp_cache_set( 'notoptions', $notoptions, 'options' ); |
| 86 | |
| 87 | /** This filter is documented in wp-includes/option.php */ |
| 88 | return apply_filters( 'default_option_' . $option, $default ); |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | } else { |
| 93 | $suppress = $wpdb->suppress_errors(); |
| 94 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $option ) ); |
| 95 | $wpdb->suppress_errors( $suppress ); |
| 96 | if ( is_object( $row ) ) { |
| 97 | $value = $row->option_value; |
| 98 | } else { |
| 99 | /** This filter is documented in wp-includes/option.php */ |
| 100 | return apply_filters( 'default_option_' . $option, $default ); |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | // If home is not set use siteurl. |
| 105 | if ( 'home' == $option && '' == $value ) |
| 106 | return get_option( 'siteurl' ); |
| 107 | |
| 108 | if ( in_array( $option, array('siteurl', 'home', 'category_base', 'tag_base') ) ) |
| 109 | $value = untrailingslashit( $value ); |