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Usage

<?php
add_action('wp_insert_comment','comment_inserted',99,2);

function comment_inserted($comment_id, $comment_object) {
    if ($comment_object->comment_parent > 0) {
        //do something
    }
}
?>

Source File

wp_insert_comment action hook is located in wp-includes/comment.php

See also

• Plugin API
• Plugin API/Action Reference