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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 |
|---|---|
| 1043 | */ |
| 1044 | function wp_doing_ajax() { |
| 1045 | /** |
| 1046 | * Filters whether the current request is a WordPress Ajax request. |
| 1047 | * |
| 1048 | * @since 4.7.0 |
| 1049 | * |
| 1050 | * @param bool $wp_doing_ajax Whether the current request is a WordPress Ajax request. |
| 1051 | */ |
| 1052 | return apply_filters( 'wp_doing_ajax', defined( 'DOING_AJAX' ) && DOING_AJAX ); |
| 1053 | } |
| 1054 | |
| 1055 | /** |
| 1056 | * Check whether variable is a WordPress Error. |
| 1057 | * |
| 1058 | * Returns true if $thing is an object of the WP_Error class. |
| 1059 | * |
| 1060 | * @since 2.1.0 |
| 1061 | * |