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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 |
|---|---|
| 492 | if ( !$post = & get_post($id) ) |
| 493 | return false; |
| 494 | |
| 495 | if ( $innerHTML = get_attachment_icon($post->ID, $fullsize, $max_dims)) |
| 496 | return $innerHTML; |
| 497 | |
| 498 | |
| 499 | $innerHTML = attribute_escape($post->post_title); |
| 500 | |
| 501 | return apply_filters('attachment_innerHTML', $innerHTML, $post->ID); |
| 502 | } |
| 503 | |
| 504 | function prepend_attachment($content) { |
| 505 | global $post; |
| 506 | |
| 507 | if ( empty($post->post_type) || $post->post_type != 'attachment' ) |
| 508 | return $content; |
| 509 | |
| 510 | $p = '<p class="attachment">'; |