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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.
This hook occurs 2 times in this file.
Line | Code |
---|---|
1957 | * Filters the comment author's user id before it is set. |
1958 | * |
1959 | * The first time this filter is evaluated, 'user_ID' is checked |
1960 | * (for back-compat), followed by the standard 'user_id' value. |
1961 | * |
1962 | * @since 1.5.0 |
1963 | * |
1964 | * @param int $user_ID The comment author's user ID. |
1965 | */ |
1966 | $commentdata['user_id'] = apply_filters( 'pre_user_id', $commentdata['user_ID'] ); |
1967 | } elseif ( isset( $commentdata['user_id'] ) ) { |
1968 | /** This filter is documented in wp-includes/comment.php */ |
1969 | $commentdata['user_id'] = apply_filters( 'pre_user_id', $commentdata['user_id'] ); |
1970 | } |
1971 |
|
1972 | /** |
1973 | * Filters the comment author's browser user agent before it is set. |
1974 | * |
1975 | * @since 1.5.0 |
1976 | * |
1977 | * @param string $comment_agent The comment author's browser user agent. |
1978 | */ |