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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 |
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2189 | $prefiltered_user_id = ( isset( $commentdata['user_id'] ) ) ? (int) $commentdata['user_id'] : 0; |
2190 |
|
2191 | /** |
2192 | * Filters a comment's data before it is sanitized and inserted into the database. |
2193 | * |
2194 | * @since 1.5.0 |
2195 | * |
2196 | * @param array $commentdata Comment data. |
2197 | */ |
2198 | $commentdata = apply_filters( 'preprocess_comment', $commentdata ); |
2199 |
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2200 | $commentdata['comment_post_ID'] = (int) $commentdata['comment_post_ID']; |
2201 | if ( isset( $commentdata['user_ID'] ) && $prefiltered_user_id !== (int) $commentdata['user_ID'] ) { |
2202 | $commentdata['user_ID'] = (int) $commentdata['user_ID']; |
2203 | $commentdata['user_id'] = $commentdata['user_ID']; |
2204 | } elseif ( isset( $commentdata['user_id'] ) ) { |
2205 | $commentdata['user_id'] = (int) $commentdata['user_id']; |
2206 | } |
2207 |
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