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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 |
|---|---|
| 108 | $messages['attachment'] = array_fill( 1, 10, __( 'Media attachment updated.' ) ); // Hack, for now. |
| 109 | |
| 110 | /** |
| 111 | * Filter the post updated messages. |
| 112 | * |
| 113 | * @since 3.0.0 |
| 114 | * |
| 115 | * @param array $messages Post updated messages. For defaults @see $messages declarations above. |
| 116 | */ |
| 117 | $messages = apply_filters( 'post_updated_messages', $messages ); |
| 118 | |
| 119 | $message = false; |
| 120 | if ( isset($_GET['message']) ) { |
| 121 | $_GET['message'] = absint( $_GET['message'] ); |
| 122 | if ( isset($messages[$post_type][$_GET['message']]) ) |
| 123 | $message = $messages[$post_type][$_GET['message']]; |
| 124 | elseif ( !isset($messages[$post_type]) && isset($messages['post'][$_GET['message']]) ) |
| 125 | $message = $messages['post'][$_GET['message']]; |
| 126 | } |