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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 | * |