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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 |
|---|---|
| 2856 | * @uses apply_filters() Calls 'deprecated_function_trigger_error' and expects boolean value of true to do |
| 2857 | * trigger or false to not trigger error. |
| 2858 | * |
| 2859 | * @param string $function The function that was called |
| 2860 | * @param string $version The version of WordPress that deprecated the function |
| 2861 | * @param string $replacement Optional. The function that should have been called |
| 2862 | */ |
| 2863 | function _deprecated_function( $function, $version, $replacement = null ) { |
| 2864 | |
| 2865 | do_action( 'deprecated_function_run', $function, $replacement, $version ); |
| 2866 | |
| 2867 | // Allow plugin to filter the output error trigger |
| 2868 | if ( WP_DEBUG && apply_filters( 'deprecated_function_trigger_error', true ) ) { |
| 2869 | if ( function_exists( '__' ) ) { |
| 2870 | if ( ! is_null( $replacement ) ) |
| 2871 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $function, $version, $replacement ) ); |
| 2872 | else |
| 2873 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) ); |
| 2874 | } else { |