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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 |
---|---|
3701 | || function_exists( 'is_comment_feed' ) && is_comment_feed() |
3702 | || function_exists( 'is_trackback' ) && is_trackback() ) ) { |
3703 | /** |
3704 | * Filters the callback for killing WordPress execution for XML requests. |
3705 | * |
3706 | * @since 5.2.0 |
3707 | * |
3708 | * @param callable $callback Callback function name. |
3709 | */ |
3710 | $callback = apply_filters( 'wp_die_xml_handler', '_xml_wp_die_handler' ); |
3711 | } else { |
3712 | /** |
3713 | * Filters the callback for killing WordPress execution for all non-Ajax, non-JSON, non-XML requests. |
3714 | * |
3715 | * @since 3.0.0 |
3716 | * |
3717 | * @param callable $callback Callback function name. |
3718 | */ |
3719 | $callback = apply_filters( 'wp_die_handler', '_default_wp_die_handler' ); |