--TEST-- Test strftime() function : usage variation - Passing day related format strings to format argument. --FILE-- "%d", 'Day of the year as a decimal number' => "%j", 'Day of the week as a decimal number' => "%w" ); // loop through each element of the array for timestamp foreach($inputs as $key =>$value) { echo "\n--$key--\n"; var_dump( strftime($value) ); var_dump( strftime($value, $timestamp) ); }; ?> --EXPECTF-- *** Testing strftime() : usage variation *** --Day of the month as a decimal number-- Deprecated: Function strftime() is deprecated since 8.1, use IntlDateFormatter::format() instead in %s on line %d string(%d) "%d" Deprecated: Function strftime() is deprecated since 8.1, use IntlDateFormatter::format() instead in %s on line %d string(2) "08" --Day of the year as a decimal number-- Deprecated: Function strftime() is deprecated since 8.1, use IntlDateFormatter::format() instead in %s on line %d string(%d) "%d" Deprecated: Function strftime() is deprecated since 8.1, use IntlDateFormatter::format() instead in %s on line %d string(3) "221" --Day of the week as a decimal number-- Deprecated: Function strftime() is deprecated since 8.1, use IntlDateFormatter::format() instead in %s on line %d string(%d) "%d" Deprecated: Function strftime() is deprecated since 8.1, use IntlDateFormatter::format() instead in %s on line %d string(1) "5"