时,我的客户端试图在Opencart的1.4.9.3更新产品我收到此错误: 2011-08-06 13:54:29 - PHP Notice: Undefined index: quantity in /home/adesignlink/innovativetrailers4less.com/admin/model/catalog/product.php on line 198
2011-08-
通过一个例子可以很好地问道: my $var1=1;
my $var2;
my $var3=3;
# say "at least one undef" if at least one of $var1, $var2, $var3 is undef
很显然,我可以明确地循环,这样做,但我总喜欢找一个衬垫实现相同的结果。