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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 |
|---|---|
| 3733 | $callback = apply_filters( 'wp_die_ajax_handler', '_ajax_wp_die_handler' ); |
| 3734 | } elseif ( wp_is_json_request() ) { |
| 3735 | /** |
| 3736 | * Filters the callback for killing WordPress execution for JSON requests. |
| 3737 | * |
| 3738 | * @since 5.1.0 |
| 3739 | * |
| 3740 | * @param callable $callback Callback function name. |
| 3741 | */ |
| 3742 | $callback = apply_filters( 'wp_die_json_handler', '_json_wp_die_handler' ); |
| 3743 | } elseif ( wp_is_serving_rest_request() && wp_is_jsonp_request() ) { |
| 3744 | /** |
| 3745 | * Filters the callback for killing WordPress execution for JSONP REST requests. |
| 3746 | * |
| 3747 | * @since 5.2.0 |
| 3748 | * |
| 3749 | * @param callable $callback Callback function name. |
| 3750 | */ |
| 3751 | $callback = apply_filters( 'wp_die_jsonp_handler', '_jsonp_wp_die_handler' ); |