php - Sql date between query with a date and number of days -


i have table called renewals follows

id | item_name | next_renewal_date | alert_before_days 2  | test      | 2015-05-25        |  5 6  | test4     | 2015-05-12        |  2 7  | test7     | 2015-05-30        |  12

i read table alert_before_days. example, need rows upcoming renewals alert_before_days current date onwards.

i'm using cakephp , tried following, nothing works. selects date 1970-01-01

'conditions'=>array('renewal.nextrenewaldate <=' =>  date('y-m-d', strtotime("+renewal.alertbeforedays days"))

strtotime not recognize expression. mysql - 

'conditions'=>array(      'renewal.nextrenewaldate <=' => 'date_add(now() + interval `renewal`.`nextrenewaldate` day)' )

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