$month = 2;
echo sprintf("Month: %02d", $month);
echo "\n";echo str_pad($month,2,"0",STR_PAD_LEFT);
echo "\n";echo date ("m");
exit;
echo sprintf("Month: %02d", $month);
echo "\n";echo str_pad($month,2,"0",STR_PAD_LEFT);
echo "\n";echo date ("m");
exit;
$strmonth = sprintf("Month: %02d", $month);
echo $strmonth;
printf("Month: %02d", $month);我这个测试通过了