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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
1873           $src_file = basename($src);
1874      } elseif ( wp_attachment_is_image( $post->ID ) ) {
1875           // We have an image without a thumbnail
1876
1877           $src = wp_get_attachment_url( $post->ID );
1878           $src_file = & $file;
1879      } elseif ( $src = wp_mime_type_icon( $post->ID ) ) {
1880           // No thumb, no image. We'll look for a mime-related icon instead.
1881
1882           $icon_dir = apply_filters( 'icon_dir', get_template_directory() . '/images' );
1883           $src_file = $icon_dir . '/' . basename($src);
1884      }
1885
1886      if ( !isset($src) || !$src )
1887           return false;
1888
1889      return array($src, $src_file);
1890 }
1891