날짜타입을 변경하는 코드입니다..

(예: 23/02/2015 --> 2015-02-23)

1.

$date_array = explode("/",$date); // split the array

$var_day = $date_array[0]; //day seqment

$var_month = $date_array[1]; //month segment

$var_year = $date_array[2]; //year segment

$new_date_format = "$var_year-$var_month-$var_day​";

2.

date(‘Y-m-d’, strtotime(’23/02/2015′));