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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 |
|---|---|
| 3719 | || function_exists( 'is_comment_feed' ) && is_comment_feed() |
| 3720 | || function_exists( 'is_trackback' ) && is_trackback() ) ) { |
| 3721 | /** |
| 3722 | * Filters the callback for killing WordPress execution for XML requests. |
| 3723 | * |
| 3724 | * @since 5.2.0 |
| 3725 | * |
| 3726 | * @param callable $callback Callback function name. |
| 3727 | */ |
| 3728 | $callback = apply_filters( 'wp_die_xml_handler', '_xml_wp_die_handler' ); |
| 3729 | } else { |
| 3730 | /** |
| 3731 | * Filters the callback for killing WordPress execution for all non-Ajax, non-JSON, non-XML requests. |
| 3732 | * |
| 3733 | * @since 3.0.0 |
| 3734 | * |
| 3735 | * @param callable $callback Callback function name. |
| 3736 | */ |
| 3737 | $callback = apply_filters( 'wp_die_handler', '_default_wp_die_handler' ); |