php获取二十四节气，php判断某一天是否是某个节气，代码如下：

/**
 * @param int $time
 * @return mixed|string
 */
function getJieQi($time = 0) {
    date_default_timezone_set('Asia/Shanghai');
    !$time && $time = time();

    list($year, $month, $day) = explode('-', date('Y-m-d', $time));

    $solar_term = [
        0 => [621, 419, 621, 521, 622, 622, 823, 824, 824, 924, 823, 822], //1901
        1 => [621, 519, 621, 621, 622, 722, 824, 824, 824, 924, 823, 823], //1902
        2 => [621, 520, 722, 621, 722, 722, 824, 924, 924, 924, 823, 823], //1903
        3 => [721, 520, 621, 520, 621, 622, 723, 823, 823, 824, 823, 722], //1904
        4 => [621, 419, 621, 521, 622, 622, 823, 824, 824, 924, 823, 822], //1905
        5 => [621, 519, 621, 621, 622, 622, 824, 824, 824, 924, 823, 823], //1906
        6 => [621, 520, 722, 621, 722, 722, 824, 924, 924, 924, 823, 823], //1907
        7 => [721, 520, 621, 520, 621, 622, 723, 823, 823, 924, 823, 722], //1908
        8 => [621, 419, 621, 521, 622, 622, 823, 824, 824, 924, 823, 822], //1909
        9 => [621, 519, 621, 621, 622, 622, 824, 824, 824, 924, 823, 823], //1910
        10 => [621, 520, 722, 621, 722, 722, 824, 924, 924, 924, 823, 823], //1911
        11 => [721, 520, 621, 520, 621, 622, 723, 823, 823, 924, 823, 722], //1912
        12 => [620, 419, 621, 521, 622, 622, 823, 824, 824, 924, 823, 822], //1913
        13 => [621, 419, 621, 521, 622, 622, 824, 824, 824, 924, 823, 823], //1914
        14 => [621, 520, 622, 621, 622, 722, 824, 824, 924, 924, 823, 823], //1915
        15 => [621, 520, 621, 520, 621, 622, 723, 823, 823, 824, 822, 722], //1916
        16 => [620, 419, 621, 521, 621, 622, 823, 824, 823, 924, 823, 722], //1917
        17 => [621, 419, 621, 521, 622, 622, 824, 824, 824, 924, 823, 822], //1918
        18 => [621, 520, 622, 621, 622, 722, 824, 824, 924, 924, 823, 823], //1919
        19 => [621, 520, 621, 520, 621, 622, 723, 823, 823, 824, 822, 722], //1920
        20 => [620, 419, 621, 520, 621, 622, 823, 824, 823, 924, 823, 722], //1921
        21 => [621, 419, 621, 521, 622, 622, 824, 824, 824, 924, 823, 822], //1922
        22 => [621, 519, 621, 621, 622, 722, 824, 824, 924, 924, 823, 823], //1923
        23 => [621, 520, 621, 520, 621, 622, 723, 823, 823, 824, 822, 722], //1924
        24 => [620, 419, 621, 520, 621, 622, 823, 824, 823, 924, 823, 722], //1925
        25 => [621, 419, 621, 521, 622, 622, 823, 824, 824, 924, 823, 822], //1926
        26 => [621, 519, 621, 621, 622, 722, 824, 824, 824, 924, 823, 823], //1927
        27 => [621, 520, 621, 520, 621, 621, 723, 823, 823, 823, 722, 722], //1928
        28 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 824, 822, 722], //1929
        29 => [621, 419, 621, 521, 622, 622, 823, 824, 824, 924, 823, 822], //1930
        30 => [621, 519, 621, 621, 622, 722, 824, 824, 824, 924, 823, 823], //1931
        31 => [621, 520, 621, 520, 621, 621, 723, 823, 823, 823, 722, 722], //1932
        32 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 924, 823, 722], //1933
        33 => [621, 419, 621, 521, 622, 622, 823, 824, 824, 924, 823, 822], //1934
        34 => [621, 519, 621, 621, 622, 622, 824, 824, 824, 924, 823, 823], //1935
        35 => [621, 520, 621, 520, 621, 621, 723, 823, 823, 823, 722, 722], //1936
        36 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 924, 823, 722], //1937
        37 => [621, 419, 621, 521, 622, 622, 823, 824, 824, 924, 823, 822], //1938
        38 => [621, 519, 621, 621, 622, 622, 824, 824, 824, 924, 823, 823], //1939
        39 => [621, 520, 621, 520, 621, 621, 723, 823, 823, 823, 722, 722], //1940
        40 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 924, 823, 722], //1941
        41 => [621, 419, 621, 521, 622, 622, 823, 824, 824, 924, 823, 822], //1942
        42 => [621, 519, 621, 621, 622, 622, 824, 824, 824, 924, 823, 823], //1943
        43 => [621, 520, 621, 520, 521, 621, 723, 823, 823, 823, 722, 722], //1944
        44 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 824, 822, 722], //1945
        45 => [620, 419, 621, 521, 622, 622, 823, 824, 823, 924, 823, 822], //1946
        46 => [621, 419, 621, 521, 622, 622, 824, 824, 824, 924, 823, 823], //1947
        47 => [621, 520, 521, 520, 521, 621, 723, 723, 823, 823, 722, 722], //1948
        48 => [520, 419, 621, 520, 621, 622, 723, 824, 823, 824, 822, 722], //1949
        49 => [620, 419, 621, 520, 621, 622, 823, 824, 823, 924, 823, 822], //1950
        50 => [621, 419, 621, 521, 622, 622, 824, 824, 824, 924, 823, 823], //1951
        51 => [621, 520, 521, 520, 521, 621, 723, 723, 823, 823, 722, 722], //1952
        52 => [520, 419, 621, 520, 621, 622, 723, 823, 823, 824, 822, 722], //1953
        53 => [620, 419, 621, 520, 621, 622, 823, 824, 823, 923, 823, 722], //1954
        54 => [621, 419, 621, 521, 622, 622, 823, 824, 824, 924, 823, 822], //1955
        55 => [621, 520, 520, 520, 521, 621, 723, 723, 823, 823, 722, 722], //1956
        56 => [520, 419, 621, 520, 621, 622, 723, 823, 823, 824, 822, 722], //1957
        57 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 924, 823, 722], //1958
        58 => [621, 419, 621, 521, 622, 622, 823, 824, 824, 924, 823, 822], //1958
        59 => [621, 519, 520, 520, 521, 621, 723, 723, 723, 823, 722, 722], //1960
        60 => [520, 419, 621, 520, 621, 621, 723, 823, 823, 823, 722, 722], //1961
        61 => [621, 419, 621, 520, 621, 622, 723, 823, 823, 924, 823, 722], //1962
        62 => [621, 419, 621, 521, 622, 622, 823, 824, 824, 924, 823, 822], //1963
        63 => [621, 519, 520, 520, 521, 621, 723, 723, 723, 823, 722, 722], //1964
        64 => [520, 419, 621, 520, 621, 621, 723, 823, 823, 823, 722, 722], //1965
        65 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 924, 823, 722], //1966
        66 => [621, 419, 621, 521, 622, 622, 823, 824, 824, 924, 823, 822], //1967
        67 => [621, 519, 520, 520, 521, 521, 723, 723, 723, 823, 722, 722], //1968
        68 => [520, 419, 621, 520, 621, 621, 723, 823, 823, 823, 722, 722], //1969
        69 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 924, 823, 722], //1970
        70 => [621, 419, 621, 521, 622, 622, 823, 824, 824, 924, 823, 822], //1971
        71 => [621, 519, 520, 520, 521, 521, 723, 723, 723, 823, 722, 722], //1972
        72 => [520, 420, 621, 520, 521, 621, 723, 823, 823, 823, 722, 722], //1973
        73 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 924, 823, 722], //1974
        74 => [621, 419, 621, 521, 622, 622, 823, 824, 823, 924, 823, 822], //1975
        75 => [621, 519, 520, 420, 521, 521, 723, 724, 723, 823, 722, 722], //1976
        76 => [520, 419, 621, 520, 621, 621, 723, 723, 823, 823, 722, 722], //1977
        77 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 824, 823, 722], //1978
        78 => [621, 419, 621, 521, 621, 622, 823, 824, 823, 924, 823, 822], //1979
        79 => [621, 519, 520, 420, 521, 521, 723, 723, 723, 823, 722, 722], //1980
        80 => [520, 419, 621, 520, 521, 621, 723, 723, 823, 823, 822, 722], //1981
        81 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 824, 822, 722], //1982
        82 => [620, 419, 621, 520, 621, 622, 823, 824, 823, 924, 823, 822], //1983
        83 => [621, 419, 520, 420, 521, 521, 722, 723, 723, 823, 722, 722], //1984
        84 => [520, 419, 521, 520, 521, 621, 723, 723, 823, 823, 722, 722], //1985
        85 => [520, 419, 621, 520, 621, 622, 723, 823, 823, 824, 822, 722], //1986
        86 => [620, 419, 621, 520, 621, 622, 723, 824, 823, 924, 823, 722], //1987
        87 => [621, 419, 520, 420, 521, 521, 722, 723, 723, 823, 722, 721], //1988
        88 => [520, 419, 520, 520, 521, 621, 723, 723, 723, 823, 722, 722], //1989
        89 => [520, 419, 621, 520, 621, 621, 723, 823, 823, 824, 822, 722], //1990
        90 => [620, 419, 621, 520, 721, 622, 723, 823, 823, 924, 823, 722], //1991
        91 => [621, 419, 520, 420, 521, 521, 722, 723, 723, 823, 722, 721], //1992
        92 => [520, 418, 520, 520, 521, 621, 723, 723, 723, 823, 722, 722], //1993
        93 => [520, 419, 621, 520, 621, 621, 723, 823, 823, 823, 722, 722], //1994
        94 => [620, 419, 621, 520, 621, 622, 723, 821, 823, 924, 823, 722], //1995
        95 => [621, 419, 520, 420, 521, 521, 722, 723, 723, 823, 722, 721], //1996
        96 => [520, 418, 520, 520, 521, 521, 723, 723, 723, 823, 722, 722], //1997
        97 => [520, 419, 621, 520, 621, 621, 723, 823, 823, 823, 722, 722], //1998
        98 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 924, 823, 722], //1999
        99 => [621, 419, 520, 420, 521, 521, 722, 723, 723, 823, 722, 721], //2000
        100 => [520, 418, 520, 520, 521, 521, 723, 723, 723, 823, 722, 722], //2001
        101 => [520, 419, 621, 520, 621, 621, 723, 823, 823, 823, 722, 722], //2002
        102 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 924, 823, 722], //2003
        103 => [621, 419, 520, 420, 521, 521, 722, 723, 723, 823, 722, 721], //2004
        104 => [520, 418, 520, 520, 521, 521, 723, 723, 723, 823, 722, 722], //2005
        105 => [520, 419, 621, 520, 521, 621, 723, 723, 823, 823, 722, 722], //2006
        106 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 924, 823, 722], //2007
        107 => [621, 419, 520, 420, 521, 521, 722, 723, 722, 823, 722, 721], //2008
        108 => [520, 418, 520, 420, 521, 521, 723, 723, 723, 823, 722, 722], //2009
        109 => [520, 419, 621, 520, 521, 621, 723, 723, 823, 823, 722, 722], //2010
        110 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 824, 823, 722], //2011
        111 => [621, 419, 520, 420, 520, 521, 722, 723, 722, 823, 722, 721], //2012
        112 => [520, 418, 520, 420, 521, 521, 722, 723, 723, 823, 722, 722], //2013
        113 => [520, 419, 621, 520, 521, 621, 723, 723, 823, 823, 722, 722], //2014
        114 => [620, 419, 621, 520, 621, 622, 723, 823, 823, 824, 822, 722], //2015
        115 => [620, 419, 520, 419, 520, 521, 722, 723, 722, 823, 722, 721], //2016
        116 => [520, 318, 520, 420, 521, 521, 722, 723, 723, 823, 722, 722], //2017
        117 => [520, 419, 521, 520, 521, 621, 723, 723, 823, 823, 722, 722], //2018
        118 => [520, 419, 621, 520, 621, 621, 723, 823, 823, 824, 822, 722], //2019
        119 => [620, 419, 520, 419, 520, 521, 622, 722, 722, 823, 722, 721], //2020
        120 => [520, 318, 520, 420, 521, 521, 722, 723, 723, 823, 722, 721], //2021
        121 => [520, 419, 520, 520, 521, 621, 723, 723, 723, 823, 722, 722], //2022
        122 => [520, 419, 621, 520, 621, 621, 723, 823, 823, 824, 822, 722], //2023
        123 => [620, 419, 520, 419, 520, 521, 622, 722, 722, 823, 722, 621], //2024
        124 => [520, 318, 520, 420, 521, 521, 722, 723, 723, 823, 722, 721], //2025
        125 => [520, 418, 520, 520, 521, 521, 723, 723, 723, 823, 722, 722], //2026
        126 => [520, 419, 621, 520, 621, 621, 723, 823, 823, 823, 722, 722], //2027
        127 => [620, 419, 520, 419, 520, 521, 622, 722, 722, 823, 722, 621], //2028
        128 => [520, 318, 520, 420, 521, 521, 722, 723, 723, 823, 722, 721], //2029
        129 => [520, 418, 520, 520, 521, 521, 723, 723, 723, 823, 722, 722], //2030
        130 => [520, 419, 621, 520, 621, 621, 723, 823, 823, 823, 722, 722], //2031
        131 => [620, 419, 520, 419, 520, 521, 622, 722, 722, 823, 722, 621], //2032
        132 => [520, 318, 520, 420, 521, 521, 723, 723, 723, 823, 722, 721], //2033
        133 => [520, 418, 520, 520, 521, 521, 723, 823, 723, 823, 722, 722], //2034
        134 => [520, 419, 621, 520, 521, 621, 723, 723, 823, 823, 722, 722], //2035
        135 => [620, 419, 520, 419, 520, 521, 622, 722, 722, 823, 722, 621], //2036
        136 => [520, 318, 520, 420, 521, 521, 722, 723, 723, 823, 722, 721], //2037
        137 => [520, 418, 520, 520, 521, 521, 723, 723, 723, 823, 722, 722], //2038
        138 => [520, 419, 621, 520, 521, 621, 723, 723, 823, 823, 722, 722], //2039
        139 => [620, 419, 520, 419, 520, 521, 622, 722, 722, 823, 722, 621], //2040
        140 => [520, 318, 520, 420, 520, 521, 722, 723, 722, 823, 722, 721], //2041
        141 => [520, 418, 520, 420, 521, 521, 723, 723, 723, 823, 722, 722], //2042
        142 => [520, 419, 621, 520, 521, 621, 723, 723, 823, 823, 722, 722], //2043
        143 => [620, 419, 520, 419, 520, 521, 622, 722, 722, 723, 722, 621], //2044
        144 => [520, 318, 520, 419, 520, 521, 722, 723, 722, 823, 722, 721], //2045
        145 => [520, 418, 520, 420, 521, 521, 722, 723, 723, 823, 722, 722], //2046
        146 => [520, 419, 621, 520, 521, 621, 723, 723, 823, 823, 722, 722], //2047
        147 => [620, 419, 520, 419, 520, 520, 622, 722, 722, 723, 721, 621], //2048
        148 => [519, 318, 520, 520, 520, 521, 622, 722, 722, 823, 722, 721], //2049
        149 => [520, 318, 520, 420, 521, 521, 722, 723, 823, 823, 722, 722] //2050
    ];

    //节气名称
    $term_name = [
        '小寒', '大寒', '立春', '雨水', '惊蛰', '春分', '清明', '谷雨',
        '立夏', '小满', '芒种', '夏至', '小暑', '大暑', '立秋', '处暑',
        '白露', '秋分', '寒露', '霜降', '立冬', '小雪', '大雪', '冬至'];

    //算取在数组中的位置
    $line = $year - 1901;
    $row = $month - 1;

    //显示相应的节气
    if ($day == substr($solar_term[$line][$row], 0, 1)) {
        $term = $term_name[($month - 1) * 2];
    } else if ($day == substr($solar_term[$line][$row], 1, 2)) {
        $term = $term_name[($month - 1) * 2 + 1];
    } else {//from www.phpernote.com
        $term = '';
    }

    return $term;
}

示例：

echo getJieQi(1584652027);//春分

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