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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 4 times in this file.
| Line | Code |
|---|---|
| 1060 | */ |
| 1061 | function get_calendar($initial = true, $echo = true) { |
| 1062 | global $wpdb, $m, $monthnum, $year, $wp_locale, $posts; |
| 1063 | |
| 1064 | $cache = array(); |
| 1065 | $key = md5( $m . $monthnum . $year ); |
| 1066 | if ( $cache = wp_cache_get( 'get_calendar', 'calendar' ) ) { |
| 1067 | if ( is_array($cache) && isset( $cache[ $key ] ) ) { |
| 1068 | if ( $echo ) { |
| 1069 | echo apply_filters( 'get_calendar', $cache[$key] ); |
| 1070 | return; |
| 1071 | } else { |
| 1072 | return apply_filters( 'get_calendar', $cache[$key] ); |
| 1073 | } |
| 1074 | } |
| 1075 | } |
| 1076 | |
| 1077 | if ( !is_array($cache) ) |
| 1078 | $cache = array(); |
| 1079 | |
| 1080 | // Quick check. If we have no posts at all, abort! |
| 1081 | if ( !$posts ) { |
| Line | Code |
| 1249 | if ( $pad != 0 && $pad != 7 ) |
| 1250 | $calendar_output .= "\n\t\t".'<td class="pad" colspan="'. esc_attr($pad) .'"> </td>'; |
| 1251 | |
| 1252 | $calendar_output .= "\n\t</tr>\n\t</tbody>\n\t</table>"; |
| 1253 | |
| 1254 | $cache[ $key ] = $calendar_output; |
| 1255 | wp_cache_set( 'get_calendar', $cache, 'calendar' ); |
| 1256 | |
| 1257 | if ( $echo ) |
| 1258 | echo apply_filters( 'get_calendar', $calendar_output ); |
| 1259 | else |
| 1260 | return apply_filters( 'get_calendar', $calendar_output ); |
| 1261 | |
| 1262 | } |
| 1263 | |
| 1264 | /** |
| 1265 | * Purge the cached results of get_calendar. |
| 1266 | * |
| 1267 | * @see get_calendar |
| 1268 | * @since 2.1.0 |
| 1269 | */ |