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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 |
|---|---|
| 3287 | |
| 3288 | if ( wp_doing_ajax() ) { |
| 3289 | /** |
| 3290 | * Filters the callback for killing WordPress execution for Ajax requests. |
| 3291 | * |
| 3292 | * @since 3.4.0 |
| 3293 | * |
| 3294 | * @param callable $function Callback function name. |
| 3295 | */ |
| 3296 | $function = apply_filters( 'wp_die_ajax_handler', '_ajax_wp_die_handler' ); |
| 3297 | } elseif ( wp_is_json_request() ) { |
| 3298 | /** |
| 3299 | * Filters the callback for killing WordPress execution for JSON requests. |
| 3300 | * |
| 3301 | * @since 5.1.0 |
| 3302 | * |
| 3303 | * @param callable $function Callback function name. |
| 3304 | */ |
| 3305 | $function = apply_filters( 'wp_die_json_handler', '_json_wp_die_handler' ); |