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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 |
|---|---|
| 906 | } |
| 907 | } else { |
| 908 | $constraint = ''; |
| 909 | } |
| 910 | |
| 911 | $post_title = attribute_escape($post->post_title); |
| 912 | |
| 913 | $icon = "<img src='$src' title='$post_title' alt='$post_title' $constraint/>"; |
| 914 | |
| 915 | return apply_filters( 'attachment_icon', $icon, $post->ID ); |
| 916 | } |
| 917 | |
| 918 | /** |
| 919 | * Retrieve HTML content of image element. |
| 920 | * |
| 921 | * @since 2.0.0 |
| 922 | * @deprecated Use {@link wp_get_attachment_image()} |
| 923 | * @see wp_get_attachment_image() Use instead. |
| 924 | * |