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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 |
|---|---|
| 961 | } elseif ( ( is_int($size) && $size != 0 ) or ( is_string($size) && $size != 'none' ) or $size != false ) { |
| 962 | $link_text = wp_get_attachment_image($id, $size, $icon); |
| 963 | } else { |
| 964 | $link_text = ''; |
| 965 | } |
| 966 | |
| 967 | if( trim($link_text) == '' ) |
| 968 | $link_text = $_post->post_title; |
| 969 | |
| 970 | return apply_filters( 'wp_get_attachment_link', "<a href='$url' title='$post_title'>$link_text</a>", $id, $size, $permalink, $icon, $text ); |
| 971 | } |
| 972 | |
| 973 | /** |
| 974 | * Wrap attachment in <<p>> element before content. |
| 975 | * |
| 976 | * @since 2.0.0 |
| 977 | * @uses apply_filters() Calls 'prepend_attachment' hook on HTML content. |
| 978 | * |
| 979 | * @param string $content |