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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 |
|---|---|
| 366 | // "When trying to design a foolproof system, |
| 367 | // never underestimate the ingenuity of the fools :)" -- Dougal |
| 368 | if ( 'siteurl' == $option->option_name ) |
| 369 | $option->option_value = preg_replace('|/+$|', '', $option->option_value); |
| 370 | if ( 'home' == $option->option_name ) |
| 371 | $option->option_value = preg_replace('|/+$|', '', $option->option_value); |
| 372 | if ( 'category_base' == $option->option_name ) |
| 373 | $option->option_value = preg_replace('|/+$|', '', $option->option_value); |
| 374 | $value = maybe_unserialize($option->option_value); |
| 375 | $all_options->{$option->option_name} = apply_filters('pre_option_' . $option->option_name, $value); |
| 376 | } |
| 377 | return apply_filters('all_options', $all_options); |
| 378 | } |
| 379 | |
| 380 | // expects $option_name to NOT be SQL-escaped |
| 381 | function update_option($option_name, $newvalue) { |
| 382 | global $wpdb; |
| 383 | |
| 384 | $safe_option_name = $wpdb->escape($option_name); |