PHP error happened

Technical information
Error type2
Error descriptionUse of undefined constant MYSQL_ASSOC - assumed 'MYSQL_ASSOC' (this will throw an Error in a future version of PHP)
Error file/home/webadmin/public_html/Publications/include/dbconnection.php
Error line66
SQL queryselect `id`, `pmid`, `volume`, `reference`, `pubdate`, `title`, `pages`, `abstracts`, `journal`, `authors`, `pubyear` From `publications` where `id`=1634

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