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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 |
|---|---|
| 1998 | } |
| 1999 | } else { |
| 2000 | $constraint = ''; |
| 2001 | } |
| 2002 | |
| 2003 | $post_title = esc_attr($post->post_title); |
| 2004 | |
| 2005 | $icon = "<img src='$src' title='$post_title' alt='$post_title' $constraint/>"; |
| 2006 | |
| 2007 | return apply_filters( 'attachment_icon', $icon, $post->ID ); |
| 2008 | } |
| 2009 | |
| 2010 | /** |
| 2011 | * Retrieve HTML content of image element. |
| 2012 | * |
| 2013 | * @since 2.0.0 |
| 2014 | * @deprecated 2.5.0 |
| 2015 | * @deprecated Use wp_get_attachment_image() |
| 2016 | * @see wp_get_attachment_image() |