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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 |
|---|---|
| 31 | */ |
| 32 | function get_option( $option, $default = false ) { |
| 33 | global $wpdb; |
| 34 | |
| 35 | $option = trim( $option ); |
| 36 | if ( empty( $option ) ) |
| 37 | return false; |
| 38 | |
| 39 | // Allow plugins to short-circuit options. |
| 40 | $pre = apply_filters( 'pre_option_' . $option, false ); |
| 41 | if ( false !== $pre ) |
| 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' ); |