date - How to subtract more than 1 month in PHP variable having only month part? -

i in little trouble.

i 2 variable current month , previous month:

i want month part

so have written:

$current_month = date('f'); $previous_month = date('f', strtotime($current_month.' -1 f'));

when doing echo prints :

may april

now works 1 month.

but when change value of -1 else -3, has may value.

it prints may - may

i have checked -3 months doesn't work.

also have seen in docs how subtract months date, involve whole date object, need months.

-3 month works perfectly.

$current_month = date('f'); $previous_month = date('f', strtotime('-3 month')); $previous_month = date('f', strtotime('3 month ago')); // works

Three