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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 |
|---|---|
| 821 | */ |
| 822 | function wp_get_attachment_image_src( $attachment_id, $size = 'thumbnail', $icon = false ) { |
| 823 | // get a thumbnail or intermediate image if there is one |
| 824 | $image = image_downsize( $attachment_id, $size ); |
| 825 | if ( ! $image ) { |
| 826 | $src = false; |
| 827 | |
| 828 | if ( $icon && $src = wp_mime_type_icon( $attachment_id ) ) { |
| 829 | /** This filter is documented in wp-includes/post.php */ |
| 830 | $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' ); |
| 831 | |
| 832 | $src_file = $icon_dir . '/' . wp_basename( $src ); |
| 833 | @list( $width, $height ) = getimagesize( $src_file ); |
| 834 | } |
| 835 | |
| 836 | if ( $src && $width && $height ) { |
| 837 | $image = array( $src, $width, $height ); |
| 838 | } |
| 839 | } |