php 深入理解strtotime函数的使用详解_PHP教程

echo date("Y-m-d H:i:s", strtotime("feb", strtotime("2011-03-31")));

echo date("Y-m-d H:i:s", strtotime("second sunday", strtotime("2011-01-01"))), "
"; 

switch (time->relative.first_last_day_of) { 
         case 1: /* first */ 
             time->d = 1; 
             break; 
         case 2: /* last */ 
             time->d = 0; 
             time->m++; 
             break; 
     }

echo date("Y-m-d H:i:s", strtotime("previous sunday", strtotime("2011-02-01"))), "
"; 

echo date("Y-m-d H:i:s", strtotime("last sunday", strtotime("2011-02-05"))), "
"; 

echo date("Y-m-d H:i:s", strtotime("last day", strtotime("2000-02-01"))), "
"; 

echo date("Y-m-d H:i:s", strtotime("back of 24", strtotime("2011-02-01"))), "
"; 
echo date("Y-m-d H:i:s", strtotime("front of 24", strtotime("2011-02-01"))), "
"; 

PHP_FUNCTION(strtotime) 
//  处理输入，对于是否有第二个参数有没的处理 
 //  调用相关函数，实现字符串的解析和结果计算 
//  返回结果 
} 

'yesterday' 
     { 
         DEBUG_OUTPUT("yesterday"); 
         TIMELIB_INIT; 
         TIMELIB_HAVE_RELATIVE(); 
         TIMELIB_UNHAVE_TIME(); 
         s->time->relative.d = -1; 
         TIMELIB_DEINIT; 
         return TIMELIB_RELATIVE; 
     }

typedef struct Scanner { 
         int           fd; 
         uchar        *lim, *str, *ptr, *cur, *tok, *pos; 
         unsigned int  line, len; 
         struct timelib_error_container *errors; 
         struct timelib_time *time; 
         const timelib_tzdb  *tzdb; 
     } Scanner; 
     typedef struct timelib_time { 
         timelib_sll      y, m, d;     /* Year, Month, Day */ 
         timelib_sll      h, i, s;     /* Hour, mInute, Second */ 
         double           f;           /* Fraction */ 
         int              z;           /* GMT offset in minutes */ 
         char            *tz_abbr;     /* Timezone abbreviation (display only) */ 
         timelib_tzinfo  *tz_info;     /* Timezone structure */ 
         signed int       dst;         /* Flag if we were parsing a DST zone */ 
         timelib_rel_time relative; 
         timelib_sll      sse;         /* Seconds since epoch */ 
         unsigned int   have_time, have_date, have_zone, have_relative, have_weeknr_day; 
         unsigned int   sse_uptodate; /* !0 if the sse member is up to date with the date/time members */ 
         unsigned int   tim_uptodate; /* !0 if the date/time members are up to date with the sse member */ 
         unsigned int   is_localtime; /*  1 if the current struct represents localtime, 0 if it is in GMT */ 
         unsigned int   zone_type;    /*  1 time offset,
                                       *  3 TimeZone identifier,
                                       *  2 TimeZone abbreviation */ 
     } timelib_time; 
     typedef struct timelib_rel_time { 
         timelib_sll y, m, d; /* Years, Months and Days */ 
         timelib_sll h, i, s; /* Hours, mInutes and Seconds */ 
         int weekday; /* Stores the day in 'next monday' */ 
         int weekday_behavior; /* 0: the current day should *not* be counted when advancing forwards; 1: the current day *should* be counted */ 
         int first_last_day_of; 
         int invert; /* Whether the difference should be inverted */ 
         timelib_sll days; /* Contains the number of *days*, instead of Y-M-D differences */ 
         timelib_special  special; 
         unsigned int   have_weekday_relative, have_special_relative; 
     } timelib_rel_time;

reltextunit = (('sec'|'second'|'min'|'minute'|'hour'|'day'|'fortnight'|'forthnight'|'month'|'year') 's'?) | 'weeks' | daytext; 
relnumber = ([+-]*[ /t]*[0-9]+); 
relative = relnumber space? (reltextunit | 'week' ); 

case TIMELIB_MONTH:  s->time->relative.m += amount * relunit->multiplier; break;