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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 |
|---|---|
| 3080 | |
| 3081 | if ( $this->current_post == -1 ) // loop has just started |
| 3082 | /** |
| 3083 | * Fires once the loop is started. |
| 3084 | * |
| 3085 | * @since 2.0.0 |
| 3086 | * |
| 3087 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 3088 | */ |
| 3089 | do_action_ref_array( 'loop_start', array( &$this ) ); |
| 3090 | |
| 3091 | $post = $this->next_post(); |
| 3092 | $this->setup_postdata( $post ); |
| 3093 | } |
| 3094 | |
| 3095 | /** |
| 3096 | * Determines whether there are more posts available in the loop. |
| 3097 | * |
| 3098 | * Calls the {@see 'loop_end'} action when the loop is complete. |