Codex

Plugin API/Action Reference/comment (old status) to (new status)

Usage 

<?php
add_action('comment_unapproved_to_approved', 'comment_approved');

function comment_approved($comment) {
    if(is_email($comment->comment_author_email)) {
        //do something
    }
}
?>

Source File

comment_(old status)_to_(new status) action hook is located in wp-includes/comment.php

See also

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