常用时间格式与PHP时间格式相互转换

 　　例如有常用时间格式 yyyy-mm-dd HH:ii:ss，如何转换成PHP中date函数可使用的时间格式呢？

　　使用 PHPTimeFormatFromCommon() 可以把通用时间格式转换成PHP时间格式

　　　　PHPTimeFormatFromCommon("yyyy-mm-dd HH:ii:ss") => "Y-m-d H:i:s"

　　使用 PHPTimeFormatToCommon() 可以把PHP时间格式转换成通用时间格式

　　　　PHPTimeFormatToCommon("Y-m-d H:i:s") =>  "yyyy-mm-dd HH:ii:ss"

　　例如：

　　　　echo gmdate(PHPTimeFormatFromCommon("yyyy-mm-dd HH:ii:ss A DD"), time() + 8 * 3600);

　　结果：

　　　　2010-04-10 11:11:54 AM Saturday

　　具体使用说明请看代码中的注释，有详细说明。 

/*     PHP Time Formatting Functions
    Author: Fenying     Version: 1.0.0.1
    Time: 2010-04-10     CopyRight: All CopyRight Fenying Studio 2007-2010 Reserved.
*/       $DS_TIME_TimeSign = array(
        array("yyyy","<#0x01#>","Y"),
        array("yy","<#0x02#>","y"),
        array("MM","<#0x03#>","F"),
        array("mm","<#0x04#>","m"),
        array("M","<#0x05#>","M"),
        array("m","<#0x06#>","n"),
        array("t","<#0x07#>","t"),
        array("dd","<#0x08#>","d"),
        array("d","<#0x09#>","j"),
        array("DD","<#0x10#>","l"),
        array("D","<#0x11#>","jS"),
        array("z","<#0x12#>","z"),
        array("W","<#0x13#>","W"),
        array("HH","<#0x14#>","H"),
        array("hh","<#0x15#>","h"),
        array("H","<#0x16#>","G"),
        array("h","<#0x17#>","g"),
        array("ii","<#0x18#>","i"),
        array("ss","<#0x19#>","s"),
        array("c","<#0x20#>","c"),
        array("r","<#0x21#>","r"),
        array("a","<#0x22#>","a"),
        array("A","<#0x23#>","A")
    );

    $DS_TIME_SpecialChars = array(
        "d","D","j","l","N","S","w","z",
        "W","F","m","M","n","t","L","o",
        "Y","y","a","A","B","g","G","h",
        "H","i","s","e","I","O","T","Z",
        "c","r","U"
    );

/*
    yyyy = 四位数年份
    yy = 两位数年份

    MM = 月份，英文完整单词
    mm = 月份，数字，自动补0
    M = 月份，英文缩写单词
    m = 月份，数字，不补0
    t = 月份天数，数字

    dd = 日期，数字，自动补0
    d = 日期，数字，不补0
    DD = 星期，完整单词
    D = 日期，数字，带st、nd、rd或th后缀
    z = 天，数字，表示本年第几天

    W = 周，数字，表示本年第几周

    a = am或pm
    A = AM或PM
    HH = 小时，数字，24小时制，自动补0
    hh = 小时，数字，12小时制，自动补0
    H = 小时，数字，24小时制，不补0
    h = 小时，数字，12小时制，不补0

    ii = 分钟，数字，自动补0
    ss = 秒钟，数字，自动补0

    c = ISO 8601 格式的日期
    r = RFC 822 格式的日期

*/

    function PHPTimeFormatFromCommon($TimeFormat)
    {
        global $DS_TIME_TimeSign,$DS_TIME_SpecialChars;
        foreach ($DS_TIME_TimeSignas $Item)
            $TimeFormat = str_replace($Item[0],$Item[1],$TimeFormat);

        foreach ($DS_TIME_SpecialCharsas $Item)
            $TimeFormat = str_replace($Item,"//".$Item,$TimeFormat);

        foreach ($DS_TIME_TimeSignas $Item)
            $TimeFormat = str_replace($Item[1],$Item[2],$TimeFormat);

        return $TimeFormat;
    }

    function PHPTimeFormatToCommon($TimeFormat)
    {
        global $DS_TIME_TimeSign,$DS_TIME_SpecialChars;
        foreach ($DS_TIME_TimeSignas $Item)
            $TimeFormat = str_replace($Item[2],$Item[1],$TimeFormat);

        foreach ($DS_TIME_SpecialCharsas $Item)
            $TimeFormat = str_replace("//".$Item,$Item, $TimeFormat);

        foreach ($DS_TIME_TimeSignas $Item)
            $TimeFormat = str_replace($Item[1],$Item[0],$TimeFormat);

        return $TimeFormat;
    }