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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 |
|---|---|
| 2959 | * @param string $function The function that was called |
| 2960 | * @param string $version The version of WordPress that deprecated the function |
| 2961 | * @param string $replacement Optional. The function that should have been called |
| 2962 | */ |
| 2963 | function _deprecated_function($function, $version, $replacement=null) { |
| 2964 | |
| 2965 | do_action('deprecated_function_run', $function, $replacement); |
| 2966 | |
| 2967 | // Allow plugin to filter the output error trigger |
| 2968 | if( WP_DEBUG && apply_filters( 'deprecated_function_trigger_error', true )) { |
| 2969 | if( !is_null($replacement) ) |
| 2970 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $function, $version, $replacement ) ); |
| 2971 | else |
| 2972 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) ); |
| 2973 | } |
| 2974 | } |
| 2975 | |
| 2976 | /** |
| 2977 | * Marks a file as deprecated and informs when it has been used. |