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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 |
|---|---|
| 246 | // "When trying to design a foolproof system, |
| 247 | // never underestimate the ingenuity of the fools :)" -- Dougal |
| 248 | if ( 'siteurl' == $option->option_name ) |
| 249 | $option->option_value = preg_replace('|/+$|', '', $option->option_value); |
| 250 | if ( 'home' == $option->option_name ) |
| 251 | $option->option_value = preg_replace('|/+$|', '', $option->option_value); |
| 252 | if ( 'category_base' == $option->option_name ) |
| 253 | $option->option_value = preg_replace('|/+$|', '', $option->option_value); |
| 254 | $value = maybe_unserialize($option->option_value); |
| 255 | $all_options->{$option->option_name} = apply_filters('pre_option_' . $option->option_name, $value); |
| 256 | } |
| 257 | return apply_filters('all_options', $all_options); |
| 258 | } |
| 259 | |
| 260 | function update_option($option_name, $newvalue) { |
| 261 | global $wpdb; |
| 262 | |
| 263 | if ( is_string($newvalue) ) |
| 264 | $newvalue = trim($newvalue); |