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PHP cal_days_in_month() 函数
demo_func_cal_days_in_month
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<!DOCTYPE html> <html> <body> <?php $d=cal_days_in_month(CAL_GREGORIAN,2,1965); echo "There was $d days in February 1965.<br>"; $d=cal_days_in_month(CAL_GREGORIAN,2,2004); echo "There was $d days in February 2004."; ?> </body> </html>