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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 |
|---|---|
| 36 | </div> |
| 37 | <?php if ( $post_type_object->public ) : ?> |
| 38 | <div id="preview-action"> |
| 39 | <?php |
| 40 | if ( 'publish' == $post->post_status ) { |
| 41 | $preview_link = esc_url( get_permalink( $post->ID ) ); |
| 42 | $preview_button = __( 'Preview Changes' ); |
| 43 | } else { |
| 44 | $preview_link = set_url_scheme( get_permalink( $post->ID ) ); |
| 45 | $preview_link = esc_url( apply_filters( 'preview_post_link', add_query_arg( 'preview', 'true', $preview_link ) ) ); |
| 46 | $preview_button = __( 'Preview' ); |
| 47 | } |
| 48 | ?> |
| 49 | <a class="preview button" href="<?php echo $preview_link; ?>" target="wp-preview" id="post-preview"><?php echo $preview_button; ?></a> |
| 50 | <input type="hidden" name="wp-preview" id="wp-preview" value="" /> |
| 51 | </div> |
| 52 | <?php endif; // public post type ?> |
| 53 | <div class="clear"></div> |
| 54 | </div><!-- #minor-publishing-actions --> |