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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 |
|---|---|
| 1916 | if ( !$post = get_post($id) ) |
| 1917 | return false; |
| 1918 | |
| 1919 | if ( !$src = get_attachment_icon_src( $post->ID, $fullsize ) ) |
| 1920 | return false; |
| 1921 | |
| 1922 | list($src, $src_file) = $src; |
| 1923 | |
| 1924 | // Do we need to constrain the image? |
| 1925 | if ( ($max_dims = apply_filters('attachment_max_dims', $max_dims)) && file_exists($src_file) ) { |
| 1926 | |
| 1927 | $imagesize = @getimagesize($src_file); |
| 1928 | |
| 1929 | if (($imagesize[0] > $max_dims[0]) || $imagesize[1] > $max_dims[1] ) { |
| 1930 | $actual_aspect = $imagesize[0] / $imagesize[1]; |
| 1931 | $desired_aspect = $max_dims[0] / $max_dims[1]; |
| 1932 | |
| 1933 | if ( $actual_aspect >= $desired_aspect ) { |
| 1934 | $height = $actual_aspect * $max_dims[0]; |