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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 |
|---|---|
| 234 | } |
| 235 | |
| 236 | // If home is not set use siteurl. |
| 237 | if ( 'home' == $setting && '' == $value ) |
| 238 | return get_option( 'siteurl' ); |
| 239 | |
| 240 | if ( in_array( $setting, array('siteurl', 'home', 'category_base', 'tag_base') ) ) |
| 241 | $value = untrailingslashit( $value ); |
| 242 | |
| 243 | return apply_filters( 'option_' . $setting, maybe_unserialize( $value ) ); |
| 244 | } |
| 245 | |
| 246 | |
| 247 | function wp_protect_special_option( $option ) { |
| 248 | $protected = array( 'alloptions', 'notoptions' ); |
| 249 | if ( in_array( $option, $protected ) ) |
| 250 | die( sprintf( __( '%s is a protected WP option and may not be modified' ), wp_specialchars( $option ) ) ); |
| 251 | } |
| 252 | |