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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 |
|---|---|
| 543 | $id = (int) $id; |
| 544 | |
| 545 | if ( $innerHTML = get_attachment_icon($id, $fullsize, $max_dims)) |
| 546 | return $innerHTML; |
| 547 | |
| 548 | $post = & get_post($id); |
| 549 | |
| 550 | $innerHTML = $post->post_title; |
| 551 | |
| 552 | return apply_filters('attachment_innerHTML', $innerHTML, $post->ID); |
| 553 | } |
| 554 | |
| 555 | function prepend_attachment($content) { |
| 556 | $p = '<p class="attachment">'; |
| 557 | $p .= get_the_attachment_link(false, true, array(400, 300)); |
| 558 | $p .= '</p>'; |
| 559 | $p = apply_filters('prepend_attachment', $p); |
| 560 | |
| 561 | return "$p\n$content"; |