通過一個例子可以很好地問道: my $var1=1;
my $var2;
my $var3=3;
# say "at least one undef" if at least one of $var1, $var2, $var3 is undef
很顯然,我可以明確地循環,這樣做,但我總喜歡找一個襯墊實現相同的結果。
時,我的客戶端試圖在Opencart的1.4.9.3更新產品我收到此錯誤: 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-