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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.
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2200 |
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2201 | /** |
2202 | * Filters a comment's data before it is sanitized and inserted into the database. |
2203 | * |
2204 | * @since 1.5.0 |
2205 | * @since 5.6.0 Comment data includes the `comment_agent` and `comment_author_IP` values. |
2206 | * |
2207 | * @param array $commentdata Comment data. |
2208 | */ |
2209 | $commentdata = apply_filters( 'preprocess_comment', $commentdata ); |
2210 |
|
2211 | $commentdata['comment_post_ID'] = (int) $commentdata['comment_post_ID']; |
2212 | if ( isset( $commentdata['user_ID'] ) && $prefiltered_user_id !== (int) $commentdata['user_ID'] ) { |
2213 | $commentdata['user_ID'] = (int) $commentdata['user_ID']; |
2214 | $commentdata['user_id'] = $commentdata['user_ID']; |
2215 | } elseif ( isset( $commentdata['user_id'] ) ) { |
2216 | $commentdata['user_id'] = (int) $commentdata['user_id']; |
2217 | } |
2218 |
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