預定義常量
下列常量由此擴充套件定義，且僅在此擴充套件編譯入 PHP 或在執行時動態載入時可用。
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CAL_GREGORIAN(integer) -
CAL_JULIAN(integer) -
CAL_JEWISH(integer) -
CAL_FRENCH(integer) -
CAL_NUM_CALS(integer) -
CAL_DOW_DAYNO(integer) -
CAL_DOW_SHORT(integer) -
CAL_DOW_LONG(integer) -
CAL_MONTH_GREGORIAN_SHORT(integer) -
CAL_MONTH_GREGORIAN_LONG(integer) -
CAL_MONTH_JULIAN_SHORT(integer) -
CAL_MONTH_JULIAN_LONG(integer) -
CAL_MONTH_JEWISH(integer) -
CAL_MONTH_FRENCH(integer)
以下常量自 PHP 4.3.0 起可用：
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CAL_EASTER_DEFAULT(integer) -
CAL_EASTER_ROMAN(integer) -
CAL_EASTER_ALWAYS_GREGORIAN(integer) -
CAL_EASTER_ALWAYS_JULIAN(integer)
以下常量自 PHP 5.0.0 起可用：
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CAL_JEWISH_ADD_ALAFIM_GERESH(integer) -
CAL_JEWISH_ADD_ALAFIM(integer) -
CAL_JEWISH_ADD_GERESHAYIM(integer)