@ENV{qw(VAR1 VAR2 VAR3)} =qw(variable1 variable2 variable3); while(my$line = <DATA> ) { lastunless$line =~/\S/; chomp$line; my@components =splitqr{/}, $line; formy$c ( @components ) { if(my($var) = $c =~m{^\$(\w
sub AUTOLOAD { my $self = shift; my $type = ref ($self) || croak "$self is not an object"; my $field = $AUTOLOAD; $field =~ s/.*://; unless (exists $self->{$field}) { croak "$field does not exist in object/class $type"; } if (@_) { return $self->($name) = ...
GNU General Public License, which may be foundinthe Perl5source kit. Complete documentationforPerl, including FAQ lists, should be foundonthissystemusing"man perl"or"perldoc perl". If you have access to the Internet, point your browser at http://www.perl.org/, the Perl Home Page.12345678 ...
gt Returns True if the operand on the left is stringwise greater than the operand on the right of the operator. Returns False otherwise. cmp Returns -1, 0, or 1 if the left operand is stringwise less than, equal to, or greater than the right operand. , Evaluates the left operand, t...
if ($year > 1999) { warn "Debug: millennium bug in year $year\n" ; } ## DEBUG_END When theDEBUGenvironment variable exists, the filter ensures that Perl parses only the code between theDEBUG_BEGINandDEBUG_ENDmarkers. That means that whenDEBUGdoes exist, the code above should be passed...
If this environment variable isn't set; then verify_hostname defaults to 1. Please note that that recently the overall effect of this option with regards to SSL handling has changed. As of version 6.11 of LWP::Protocol::https, which is an external module, SSL certificate verification was ...
if ($year > 1999) { warn "Debug: millennium bug in year $year\n"; } ## DEBUG_END The filter ensures that Perl parses the code between the <DEBUG_BEGIN> and"DEBUG_END"markers only when the"DEBUG"environment variable exists. That means that when"DEBUG"does exist, the code above shou...
If you get a core dump, try to include a stack trace from it. Try installing the Devel::CoreStack module to get a stack trace. If the stack trace mentions XS_DynaLoader_dl_load_file then rerun make test after setting the environment variable PERL_DL_DEBUG to 2. ...
词法范围通常是一个带有一组括号的代码块,例如定义子例程主体的那些或标记if, while, for, foreach,和eval语句的代码块的代码块。 以下是一个示例,说明如何使用my运算符定义单个或多个私有变量 - sub somefunc { my $variable; # $variable is invisible outside somefunc() my ($another, @an_array, %...
Mandatory, but can be disabled by setting environment variable "PERL_BADFREE" to 0. This message can be seen quite often with DB_File on systems with "hard" dynamic linking, like "AIX" and "OS/2". It is a bug of "Berkeley DB" which is left unnoticed if "DB" uses forgiving system...