Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Simple try catch block in Perl
Answer:
Perl don't have try/catch statement by default, but you can simulate using the following way:
eval {
print 1/0;
};
if ($@) {
print "Error message: $@";
};
When executed, it shows:
Error message: Illegal division by zero at test.pl line 7.
Array reference in Perl
Answer:
Array reference is something like a pointer to a array data structure in Perl
Example:
use strict;
use warnings;
my @a = (1, 2, 3);
my $array_ref = \@a;
$a[2] = "foo";
print $array_ref->[2]; # print out "foo" as change in @a will also be reflected in its reference
Hash reference in Perl
Answer:
Hash reference is something like a pointer to a hash data structure in Perl
Example:
my %hash = (
"a" => "1",
"b" => "2",
);
my $hash_ref = \%hash;
$hash{"a"} = "A";
print $hash_ref->{"a"}; # print out "A" as change in %hash also reflected in its reference
Convert array to object in PHP
Answer:
It is easy to cast an object to an array in PHP, using the following method.
<?php
$obj = new stdClass();
$obj->foo = "foo";
$obj->bar = "bar";
var_dump ( (array) $obj );
It will print out...
array(2) {
["foo"]=>
string(3) "foo"
["bar"]=>
string(3) "bar"
}
A simple hash in Perl
Answer:
Hash is a dictionary like data structure in Perl. It allows you to direct access to a particular element inside a hash.
Example:
use strict;
use warnings;
my %hash = (
"a" => "1",
"b" => "2",
);
print $hash{"b"}; # print "2"
