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 <?php
/**
php ¹ºÎﳵʵÀý
ÍøÉÏËѵ½µÄ£¬¼òµ¥ÈÝÒ×Àí½â¡£cookie´æ¹ºÎï³µID£¬db´æ¹ºÎï³µÊý¾Ý¡£ ¹ºÎï³µsessionµÄ²úÉú´úÂë
*/
if(! $session && ! $scid) {
/*
sessionÓÃÀ´Çø±ðÿһ¸ö¹ºÎï³µ£¬Ï൱ÓÚÿ¸ö³µµÄÉí·ÝÖ¤ºÅ£»
scidÖ»ÓÃÀ´±êʶһ¸ö¹ºÎï³µidºÅ£¬¿ÉÒÔ¿´×öÊÇÿ¸ö³µµÄÃû×Ö£»
µ±¸Ã¹ºÎï³µµÄidºÍsessionÖµÁ½Õß¶¼²»´æÔÚʱ£¬¾Í²úÉúÒ»¸öйºÎï³µ
*/
$session = md5(uniqid(rand()));
/*
²úÉúÒ»¸öΨһµÄ¹ºÎï³µsessionºÅ
rand()ÏȲúÉú¸öËæ»úÊý£¬uniqid()ÔÙÔÚ¸ÃËæ»úÊýµÄ»ù´¡ÉϲúÉúÒ»¸ö¶ÀÒ»ÎÞ¶þµÄ×Ö·û´®£¬×îºó¶Ô¸Ã×Ö·û´®½øÐÐmd5
*/
SetCookie(scid, $session, time() + 14400);
/*
ÉèÖøùºÎï³µcookie
±äÁ¿Ãû£ºscid£¨²»Öªµ½ÕâÀïÊDz»ÊÇÉÙÁËÒ»¸ö $ºÅÄØ£¿=¡·¸üÕý£ºscidÒª¼Ó“”£©
±äÁ¿Öµ£º $session
ÓÐЧʱ¼ä£ºµ±Ç°Ê±¼ä+14400Ã루4СʱÄÚ£©
¹ØÓÚsetcookieº¯ÊýµÄÏêϸÓ÷¨£¬´ó¼Ò»¹ÊDzο´phpÊÖ²á°É~
*/
}
class Cart { //¿ªÊ¼¹ºÎï³µÀà
function check_item( $table, $session, $product) {
/*
²éÑéÎïÆ·(±íÃû£¬session£¬ÎïÆ·)
*/
$query = SELECT * from $table WHERE session=' $session' AND product=' $product' ;
/*
¿´Ò»¿´'±í'Àï¸Ã'¹ºÎï³µ'ÖÐÓÐûÓиÃ'²úÆ·'
¼´£¬¸Ã²úÆ·ÓÐûÓÐÒѾ­·ÅÈ빺Îï³µ
*/
$result = mysql_query( $query);
if(! $result) {
return 0;
}
/*
²éѯʧ°Ü
*/
$numRows = mysql_num_rows( $result);
if( $numRows == 0) {
return 0;
/*
ÈôûÓÐÕÒµ½£¬Ôò·µ»Ø0
*/
} else {
$row = mysql_fetch_object( $result);
return $row->quantity;
/*
ÈôÕÒµ½£¬Ôò·µ»Ø¸ÃÎïÆ·ÊýÁ¿
ÕâÀïÓбØÒª½âÊÍÒ»ÏÂmysql_fetch_objectº¯Êý£¨ÏÂÃæ»¹»áÓõ½£©£º
¡¾mysql_fetch_object() ºÍ mysql_fetch_array() ÀàËÆ£¬Ö»ÓÐÒ»µãÇø±ð - ·µ»ØÒ»¸ö¶ÔÏó¶ø²»ÊÇÊý×é¡£¡¿
ÉÏÃæÕâ¾ä»°Õª×ÔphpÊֲᣬ˵µÃÓ¦¸ÃºÜÃ÷°×Á˰É~
¼òµ¥µÄ˵¾ÍÊÇ£¬È¡Ò»Ìõ¼Ç¼ÖеÄij¸ö×ֶΣ¬Ó¦¸ÃÓÓ->”¶ø²»ÊÇÏñÊý×éÒ»ÑùÓÃϱê
*/
}
}
function add_item( $table, $session, $product, $quantity) {
/*
Ìí¼ÓÐÂÎïÆ·(±íÃû£¬session£¬ÎïÆ·£¬ÊýÁ¿)
*/
$qty = $this->check_item( $table, $session, $product);
/*
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*/
if( $qty == 0) {
$query = INSERT INTO $tabl


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