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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 |
|---|---|
| 419 | if ( !$post = & get_post($id) ) |
| 420 | return false; |
| 421 | |
| 422 | if ( $innerHTML = get_attachment_icon($post->ID, $fullsize, $max_dims)) |
| 423 | return $innerHTML; |
| 424 | |
| 425 | |
| 426 | $innerHTML = attribute_escape($post->post_title); |
| 427 | |
| 428 | return apply_filters('attachment_innerHTML', $innerHTML, $post->ID); |
| 429 | } |
| 430 | |
| 431 | function prepend_attachment($content) { |
| 432 | $p = '<p class="attachment">'; |
| 433 | $p .= get_the_attachment_link(false, true, array(400, 300)); |
| 434 | $p .= '</p>'; |
| 435 | $p = apply_filters('prepend_attachment', $p); |
| 436 | |
| 437 | return "$p\n$content"; |