Retrieve or display nonce hidden field for forms.The nonce field is used to validate that the contents of the form came from the location on the current site and not somewhere else. The nonce does not offer absolute protection, but should protect against most cases. It is very important to use nonce field in forms.
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February 12, 2011 


wp_new_comment
Adds a new comment to the database.Filters new comment to ensure that the fields are sanitized and valid before inserting comment into database. Calls ‘comment_post’ action with comment ID and whether comment is approved by WordPress. Also has ‘preprocess_comment’ filter for processing the comment data before the function handles it.
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