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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 |
|---|---|
| 2904 | * @uses do_action() Calls 'deprecated_function_run' and passes the function name and what to use instead. |
| 2905 | * @uses apply_filters() Calls 'deprecated_function_trigger_error' and expects boolean value of true to do trigger or false to not trigger error. |
| 2906 | * |
| 2907 | * @param string $function The function that was called |
| 2908 | * @param string $version The version of WordPress that deprecated the function |
| 2909 | * @param string $replacement Optional. The function that should have been called |
| 2910 | */ |
| 2911 | function _deprecated_function($function, $version, $replacement=null) { |
| 2912 | |
| 2913 | do_action('deprecated_function_run', $function, $replacement); |
| 2914 | |
| 2915 | // Allow plugin to filter the output error trigger |
| 2916 | if( defined('WP_DEBUG') && ( true === WP_DEBUG ) && apply_filters( 'deprecated_function_trigger_error', true )) { |
| 2917 | if( !is_null($replacement) ) |
| 2918 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $function, $version, $replacement ) ); |
| 2919 | else |
| 2920 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) ); |
| 2921 | } |
| 2922 | } |