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To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).
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 |
|---|---|
| 42 | return $pre; |
| 43 | |
| 44 | if ( defined( 'WP_SETUP_CONFIG' ) ) |
| 45 | return false; |
| 46 | |
| 47 | if ( ! defined( 'WP_INSTALLING' ) ) { |
| 48 | // prevent non-existent options from triggering multiple queries |
| 49 | $notoptions = wp_cache_get( 'notoptions', 'options' ); |
| 50 | if ( isset( $notoptions[$option] ) ) |
| 51 | return apply_filters( 'default_option_' . $option, $default ); |
| 52 | |
| 53 | $alloptions = wp_load_alloptions(); |
| 54 | |
| 55 | if ( isset( $alloptions[$option] ) ) { |
| 56 | $value = $alloptions[$option]; |
| 57 | } else { |
| 58 | $value = wp_cache_get( $option, 'options' ); |
| 59 | |
| 60 | if ( false === $value ) { |
| 61 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $option ) ); |
| 62 | |
| 63 | // Has to be get_row instead of get_var because of funkiness with 0, false, null values |
| 64 | if ( is_object( $row ) ) { |
| 65 | $value = $row->option_value; |
| 66 | wp_cache_add( $option, $value, 'options' ); |
| 67 | } else { // option does not exist, so we must cache its non-existence |
| 68 | $notoptions[$option] = true; |
| 69 | wp_cache_set( 'notoptions', $notoptions, 'options' ); |
| 70 | return apply_filters( 'default_option_' . $option, $default ); |
| 71 | } |
| 72 | } |
| 73 | } |
| 74 | } else { |
| 75 | $suppress = $wpdb->suppress_errors(); |
| 76 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $option ) ); |
| 77 | $wpdb->suppress_errors( $suppress ); |
| 78 | if ( is_object( $row ) ) |
| 79 | $value = $row->option_value; |
| 80 | else |
| 81 | return apply_filters( 'default_option_' . $option, $default ); |
| 82 | } |
| 83 | |
| 84 | // If home is not set use siteurl. |
| 85 | if ( 'home' == $option && '' == $value ) |
| 86 | return get_option( 'siteurl' ); |
| 87 | |
| 88 | if ( in_array( $option, array('siteurl', 'home', 'category_base', 'tag_base') ) ) |
| 89 | $value = untrailingslashit( $value ); |
| 90 | |