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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 |
|---|---|
| 1175 | return false; |
| 1176 | endif; |
| 1177 | } |
| 1178 | |
| 1179 | function wp_head() { |
| 1180 | do_action('wp_head'); |
| 1181 | } |
| 1182 | |
| 1183 | function wp_footer() { |
| 1184 | do_action('wp_footer'); |
| 1185 | } |
| 1186 | |
| 1187 | function is_single ($post = '') { |
| 1188 | global $wp_query; |
| 1189 | |
| 1190 | if ( !$wp_query->is_single ) |
| 1191 | return false; |
| 1192 | |
| 1193 | if ( empty( $post) ) |