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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 |
|---|---|
| 3609 | $function = apply_filters( 'wp_die_ajax_handler', '_ajax_wp_die_handler' ); |
| 3610 | } elseif ( wp_is_json_request() ) { |
| 3611 | /** |
| 3612 | * Filters the callback for killing WordPress execution for JSON requests. |
| 3613 | * |
| 3614 | * @since 5.1.0 |
| 3615 | * |
| 3616 | * @param callable $function Callback function name. |
| 3617 | */ |
| 3618 | $function = apply_filters( 'wp_die_json_handler', '_json_wp_die_handler' ); |
| 3619 | } elseif ( defined( 'REST_REQUEST' ) && REST_REQUEST && wp_is_jsonp_request() ) { |
| 3620 | /** |
| 3621 | * Filters the callback for killing WordPress execution for JSONP REST requests. |
| 3622 | * |
| 3623 | * @since 5.2.0 |
| 3624 | * |
| 3625 | * @param callable $function Callback function name. |
| 3626 | */ |
| 3627 | $function = apply_filters( 'wp_die_jsonp_handler', '_jsonp_wp_die_handler' ); |