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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 |
|---|---|
| 180 | * @since 1.5.0 |
| 181 | * @uses $wpdb |
| 182 | * @uses $wp_db_version |
| 183 | */ |
| 184 | function populate_options() { |
| 185 | global $wpdb, $wp_db_version, $current_site; |
| 186 | |
| 187 | $guessurl = wp_guess_url(); |
| 188 | |
| 189 | do_action('populate_options'); |
| 190 | |
| 191 | if ( ini_get('safe_mode') ) { |
| 192 | // Safe mode can break mkdir() so use a flat structure by default. |
| 193 | $uploads_use_yearmonth_folders = 0; |
| 194 | } else { |
| 195 | $uploads_use_yearmonth_folders = 1; |
| 196 | } |
| 197 | |
| 198 | $options = array( |