Invalid query: Unknown column 'c' in 'where clause' Whole query: SELECT * FROM ctr_sites_redirect WHERE (CONCAT(oldurl, '')='https://www.museuegipci.com:443/includes/templates/'+c+'/' OR CONCAT(oldurl, '/')='https://www.museuegipci.com:443/includes/templates/'+c+'/') AND status='1' AND remove='0'