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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 |
|---|---|
| 275 | if ( 'siteurl' == $option->option_name ) |
| 276 | $option->option_value = preg_replace('|/+$|', '', $option->option_value); |
| 277 | if ( 'home' == $option->option_name ) |
| 278 | $option->option_value = preg_replace('|/+$|', '', $option->option_value); |
| 279 | if ( 'category_base' == $option->option_name ) |
| 280 | $option->option_value = preg_replace('|/+$|', '', $option->option_value); |
| 281 | $value = maybe_unserialize($option->option_value); |
| 282 | $all_options->{$option->option_name} = apply_filters('pre_option_' . $option->option_name, $value); |
| 283 | } |
| 284 | return apply_filters('all_options', $all_options); |
| 285 | } |
| 286 | |
| 287 | function wp_load_alloptions() { |
| 288 | global $wpdb; |
| 289 | |
| 290 | $alloptions = wp_cache_get('alloptions', 'options'); |
| 291 | |
| 292 | if ( !$alloptions ) { |
| 293 | $wpdb->hide_errors(); |