php计算四柱(生辰八字)，四柱即出生人的出生年、月、日、时分别称之为年柱、月柱、日柱和时柱；以天干地支纪年法表示出来每柱两个字，共八个字也称生辰八字，用以推算个人运程。(PHP calculates four pillars (eight characters of birth). Four pillars, namely the birth year, month, day and time of the person born, are called year pillars, month pillars, day pillars and time pillars respectively. Each pillar is expressed in the chronology of the heavenly stem and earth pillars, and a total of eight words are also called birth eight characters to calculate personal journey.)