PHP strtotime函数用法、实现原理和源码分析
源码位置：\ext\date\php_date.c
/*{{{protointstrtotime(stringtime[,intnow])
Convertstringrepresentationofdateandtimetoatimestamp*/
PHP_FUNCTION(strtotime)
{
char*times,*initial_ts;
int time_len,error1,error2;
structtimelib_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”,×,&time_len,&preset_ts)!=FAILURE){ /*Wehaveaninitialtimestamp*/ now=timelib_time_ctor();
initial_ts=emalloc(25); snprintf(initial_ts,24,“@%ldUTC”,preset_ts); t=timelib_strtotime(initial_ts,strlen(initial_ts),NULL,DATE_TIMEZONEDB,php_date_parse_tzfile_wrapper);/*weignoretheerrorhere,asthisshouldneverfail*/ 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); }elseif(zend_parse_parameters(ZEND_NUM_ARGS()TSRMLS_CC,“s|l”,×,&time_len,&preset_ts)!=FAILURE){ /*Wehavenoinitialtimestamp*/ 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); } } /*}}}*/