PHP strtotime函数用法、实现原理和源码分析

  • Z时代
  • 2024-01-10
  • 分类：综合

源码位置：\ext\date\php_date.c

/* {{{ proto int strtotime(string time [, int now ])
   Convert string representation of date and time to a timestamp */
PHP_FUNCTION(strtotime)
{
    char *times, *initial_ts;
    int   time_len, error1, error2;
    struct timelib_error_container *error;
    long  preset_ts = 0, ts;

    timelib_time *t, *now;

    timelib_tzinfo *tzi;

    tzi = get_timezone_info(TSRMLS_C);

    if (zend_parse_parameters_ex(ZEND_PARSE_PARAMS_QUIET, ZEND_NUM_ARGS() TSRMLS_CC, “sl”, &times, &time_len, &preset_ts) != FAILURE) {

        /* We have an initial timestamp */

        now = timelib_time_ctor();

        initial_ts = emalloc(25);

        snprintf(initial_ts, 24, “@%ld UTC”, preset_ts);

        t = timelib_strtotime(initial_ts, strlen(initial_ts), NULL, DATE_TIMEZONEDB, php_date_parse_tzfile_wrapper); /* we ignore the error here, as this should never fail */

        timelib_update_ts(t, tzi);

        now->tz_info = tzi;

        now->zone_type = TIMELIB_ZONETYPE_ID;

        timelib_unixtime2local(now, t->sse);

        timelib_time_dtor(t);

        efree(initial_ts);

    } else if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, “s|l”, &times, &time_len, &preset_ts) != FAILURE) {

        /* We have no initial timestamp */

        now = timelib_time_ctor();

        now->tz_info = tzi;

        now->zone_type = TIMELIB_ZONETYPE_ID;

        timelib_unixtime2local(now, (timelib_sll) time(NULL));

    } else {

        RETURN_FALSE;

    }

    if (!time_len) {

        timelib_time_dtor(now);   

        RETURN_FALSE;

    }

    t = timelib_strtotime(times, time_len, &error, DATE_TIMEZONEDB, php_date_parse_tzfile_wrapper);

    error1 = error->error_count;

    timelib_error_container_dtor(error);

    timelib_fill_holes(t, now, TIMELIB_NO_CLONE);

    timelib_update_ts(t, tzi);

    ts = timelib_date_to_int(t, &error2);

    timelib_time_dtor(now);

    timelib_time_dtor(t);

    if (error1 || error2) {

        RETURN_FALSE;

    } else {

        RETURN_LONG(ts);

    }

}

/* }}} */

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