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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 |
|---|---|
| 2995 | * @param string $file The file that was included |
| 2996 | * @param string $version The version of WordPress that deprecated the function |
| 2997 | * @param string $replacement Optional. The function that should have been called |
| 2998 | */ |
| 2999 | function _deprecated_file($file, $version, $replacement=null) { |
| 3000 | |
| 3001 | do_action('deprecated_file_included', $file, $replacement); |
| 3002 | |
| 3003 | // Allow plugin to filter the output error trigger |
| 3004 | if( WP_DEBUG && apply_filters( 'deprecated_file_trigger_error', true ) ) { |
| 3005 | if( !is_null($replacement) ) |
| 3006 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $file, $version, $replacement ) ); |
| 3007 | else |
| 3008 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $file, $version ) ); |
| 3009 | } |
| 3010 | } |
| 3011 | |
| 3012 | /** |
| 3013 | * Is the server running earlier than 1.5.0 version of lighttpd |