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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 |
|---|---|
| 448 | if ( !$post = & get_post($id) ) |
| 449 | return false; |
| 450 | |
| 451 | if ( !$src = get_attachment_icon_src( $post->ID, $fullsize ) ) |
| 452 | return false; |
| 453 | |
| 454 | list($src, $src_file) = $src; |
| 455 | |
| 456 | // Do we need to constrain the image? |
| 457 | if ( ($max_dims = apply_filters('attachment_max_dims', $max_dims)) && file_exists($src_file) ) { |
| 458 | |
| 459 | $imagesize = getimagesize($src_file); |
| 460 | |
| 461 | if (($imagesize[0] > $max_dims[0]) || $imagesize[1] > $max_dims[1] ) { |
| 462 | $actual_aspect = $imagesize[0] / $imagesize[1]; |
| 463 | $desired_aspect = $max_dims[0] / $max_dims[1]; |
| 464 | |
| 465 | if ( $actual_aspect >= $desired_aspect ) { |
| 466 | $height = $actual_aspect * $max_dims[0]; |