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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 |
|---|---|
| 3764 | || function_exists( 'is_comment_feed' ) && is_comment_feed() |
| 3765 | || function_exists( 'is_trackback' ) && is_trackback() ) ) { |
| 3766 | /** |
| 3767 | * Filters the callback for killing WordPress execution for XML requests. |
| 3768 | * |
| 3769 | * @since 5.2.0 |
| 3770 | * |
| 3771 | * @param callable $callback Callback function name. |
| 3772 | */ |
| 3773 | $callback = apply_filters( 'wp_die_xml_handler', '_xml_wp_die_handler' ); |
| 3774 | } else { |
| 3775 | /** |
| 3776 | * Filters the callback for killing WordPress execution for all non-Ajax, non-JSON, non-XML requests. |
| 3777 | * |
| 3778 | * @since 3.0.0 |
| 3779 | * |
| 3780 | * @param callable $callback Callback function name. |
| 3781 | */ |
| 3782 | $callback = apply_filters( 'wp_die_handler', '_default_wp_die_handler' ); |