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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 |
|---|---|
| 452 | /** |
| 453 | * Filter the title field placeholder text. |
| 454 | * |
| 455 | * @since 3.1.0 |
| 456 | * |
| 457 | * @param string $text Placeholder text. Default 'Enter title here'. |
| 458 | * @param WP_Post $post Post object. |
| 459 | */ |
| 460 | ?> |
| 461 | <label class="screen-reader-text" id="title-prompt-text" for="title"><?php echo apply_filters( 'enter_title_here', __( 'Enter title here' ), $post ); ?></label> |
| 462 | <input type="text" name="post_title" size="30" value="<?php echo esc_attr( htmlspecialchars( $post->post_title ) ); ?>" id="title" autocomplete="off" /> |
| 463 | </div> |
| 464 | <div class="inside"> |
| 465 | <?php |
| 466 | $sample_permalink_html = $post_type_object->public ? get_sample_permalink_html($post->ID) : ''; |
| 467 | $shortlink = wp_get_shortlink($post->ID, 'post'); |
| 468 | $permalink = get_permalink( $post->ID ); |
| 469 | if ( !empty( $shortlink ) && $shortlink !== $permalink && $permalink !== home_url('?page_id=' . $post->ID) ) |
| 470 | $sample_permalink_html .= '<input id="shortlink" type="hidden" value="' . esc_attr($shortlink) . '" /><a href="#" class="button button-small" onclick="prompt('URL:', jQuery(\'#shortlink\').val()); return false;">' . __('Get Shortlink') . '</a>'; |