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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 |
|---|---|
| 3399 | || function_exists( 'is_comment_feed' ) && is_comment_feed() |
| 3400 | || function_exists( 'is_trackback' ) && is_trackback() ) ) { |
| 3401 | /** |
| 3402 | * Filters the callback for killing WordPress execution for XML requests. |
| 3403 | * |
| 3404 | * @since 5.2.0 |
| 3405 | * |
| 3406 | * @param callable $function Callback function name. |
| 3407 | */ |
| 3408 | $function = apply_filters( 'wp_die_xml_handler', '_xml_wp_die_handler' ); |
| 3409 | } else { |
| 3410 | /** |
| 3411 | * Filters the callback for killing WordPress execution for all non-Ajax, non-JSON, non-XML requests. |
| 3412 | * |
| 3413 | * @since 3.0.0 |
| 3414 | * |
| 3415 | * @param callable $function Callback function name. |
| 3416 | */ |
| 3417 | $function = apply_filters( 'wp_die_handler', '_default_wp_die_handler' ); |