Perl Language Basics

Variables

Perl:   $x = 0;

Perl is a loosely typed language with only three types of variables: scalars, arrays, and hashes. Use $ for a scalar variable, @ for an array, or % for a hash (an associative array).

The scalar variable type is used for any type of simple data such as strings, integers, and numbers. In Perl, you identify and use a variable with a $ even within strings.

#!/usr/local/bin/perl -w

 
print("Content-type: text/html\n\n");

$fullname = 'Mike Prestwood';
$Age = 38;
$Weight = 162.4;

 

print "Your name is $fullname.
";
print "You are $Age and weigh $Weight.
";

 Perl Variables ($x = 0;)

Note: In PHP, you declare constants similar to how you  declare variables except you drop  the $.

Complete Example

Here is a complete example that demonstrates a few concepts (refer to comments in code):

#!/usr/local/bin/perl -w

print("Content-type: text/html\n\n");

print("");

print("");

print("");

#
#Variable are case sensitive.

#
$fullname = 'Mike Prestwood';

$FullName = 'Wes Peterson';

print "Perl vars are case sensitive: " + $FullName + "
";

$Age = 38;

$Weight = 162.4;

print "Your name is $fullname.
";

print "You are $Age and weigh $Weight.
";

#

#Now using quotes.

#
$fname = "Mike";

$lname = "Prestwood";

$fullname = $fname . $lname;

print $fullname . '
';

#
#Two literals too:

#
print "My name is " . "Mike.
";

#
#Long strings.

#
$MyMsg = "This is a long string and

unlike some other languages. PHP allows

you to put strings on multiple lines 

like this.";

print $MyMsg;

print("");

More Info

 To/From Code Guide: Variables (Cross Ref > Language Basics) vs. Other Languages