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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 |
|---|---|
| 668 | |
| 669 | // get a thumbnail or intermediate image if there is one |
| 670 | if ( $image = image_downsize($attachment_id, $size) ) |
| 671 | return $image; |
| 672 | |
| 673 | $src = false; |
| 674 | |
| 675 | if ( $icon && $src = wp_mime_type_icon($attachment_id) ) { |
| 676 | /** This filter is documented in wp-includes/post.php */ |
| 677 | $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' ); |
| 678 | $src_file = $icon_dir . '/' . wp_basename($src); |
| 679 | @list($width, $height) = getimagesize($src_file); |
| 680 | } |
| 681 | if ( $src && $width && $height ) |
| 682 | return array( $src, $width, $height ); |
| 683 | return false; |
| 684 | } |
| 685 | |
| 686 | /** |