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Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.

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Line Code
996      } elseif ( wp_attachment_is_image( $post->ID ) ) {
997           // We have an image without a thumbnail
998
999           $src = wp_get_attachment_url( $post->ID );
1000           $src_file = & $file;
1001           $class = 'attachmentimage';
1002      } elseif ( $src = wp_mime_type_icon( $post->ID ) ) {
1003           // No thumb, no image. We'll look for a mime-related icon instead.
1004
1005           $icon_dir = apply_filters( 'icon_dir', get_template_directory() . '/images' );
1006           $src_file = $icon_dir . '/' . basename($src);
1007      }
1008
1009      if ( !isset($src) || !$src )
1010           return false;
1011
1012      return array($src, $src_file);
1013 }
1014