my @ary_ref = $sth -> fetchrow_array (); 当在一个列表的范围中调用时,fetchrow_array()返回包含结果集下一行列值的数组,如果不再有行或者发生错误,则 fetchrow_array()返回一个空数组。在标量上下文中,fetchrow_array()返回数组第一个元素的值(那就是说,行的第一列), 如果不再有行或者发生错误,则...
*b{ARRAY}=\@b; 由于=好被重载,不需要写明{array} ;直接*b = \$b,*b =\&b; 就行。 现在讲讲这个typeglob 和fh。 由于现在perl中有ref 引用的,所以很少用到typeglob, 主要有以下几个用处。 1.别名, *this = *that 则 $this = $that @this = @that ,不想全改就可以local*Here::blue= \...
Perl：sub无法成功地拥有我的输入[重复]现在，你知道@_中有多少个元素，你把它们赋给$bus, @array, ...
Pass by Reference Prototypes Constant Functions Overriding Built-in Functions Autoloading Subroutine Attributes SEE ALSO NAME perlsub - Perl subroutines SYNOPSIS To declare subroutines: sub NAME; # A "forward" declaration. sub NAME(PROTO); # ditto, but with prototypes sub NAME : ATTRS;...
If an argument is an array or hash element which did not exist when the function was called, that element is created only when (and if) it is modified or a reference to it is taken. (Some earlier versions of Perl created the element whether or not the element was assigned to.) ...
print "You also can refer to the summary report from $out_file file\n\n"; } sub print_array_by_len { my ($ref, $len) = @_; my $str = "${tab}${tab}"; my $num = 0; foreach my $item (@$ref) { if ($num > 0 && $num % $len == 0) { ...
###array to save sub new { my $class = shift; #获取要求的类名,允许类被继承,以类名作为第一个参数 my @para = @_;#实例hash table my $this =[]; # Create an anonymous array #{}创建一个对不含键/值对的哈希表的引用 $this
###array to save sub new { my $class = shift; #获取要求的类名,允许类被继承,以类名作为第一个参数 my @para = @_;#实例hash table my $this =[]; # Create an anonymous array #{}创建一个对不含键/值对的哈希表的引用 $this
perlsub(1) perlsymbian(1) perlsyn(1) perlthanks(1) perlthrtut(1) perltie(1) perltoc(1) perltodo(1) perltooc(1) perltoot(1) perltrap(1) perltru64(1) perltw(1) perlunicode(1) perlunifaq(1) perluniintro(1) perluniprops(1) perlunitut(1) perlutil(1) perluts(1) perlvar(...
ARRAY(0x1a2b3c) The Perl array reference can also be passed to a subroutine as shown below. sub add_numbers { my $array_ref = shift; ... } @numbers = (11,2,3,45); $array_ref = add_numbers(\@numbers); In the above code snippet, we need to de-reference the array, so that ...