Download Special Edition Using PERL 5 for Web Programming by David Harlan PDF

By David Harlan

With a evaluate through Tom Christiansen, one of many unique Perl founders, this can be the most entire books out there, overlaying Perl OOP constitution, socket programming, HTML conversions, development net seek utilities, and extra! * Focuses seriously at the home windows NT model of Perl * offers assurance of complex Perl subject matters, together with object-oriented programming with Perl * CD-ROM contains the whole digital model of the booklet in HTML structure, in addition to different Que books

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The following list explains what happens: 1. The first variable in the list, $p1, is assigned the value of the first scalar in the @_ argument array, which is alpha. 2. Then the next variable in the list, @p2, is assigned the value of the next argument in the @_ argument array. This is an array assignment because @p2 is an array, so the entire @_ array, from its second element on, is assigned to @p2-(1, 3, 5, 7, "beta", 2, 4, 6, 8), in other words. 3. The next variable to be assigned is $p3. This variable is assigned the value of the next element in the @_ argument array-but there aren't any left, because they've all been slurped by @p2.

Perl/ && print "You said it! htm (28 of 31) [2/17/2007 1:23:01 PM] Chapter 1 -- Perl Overview print $prompt; } Bound Matches Matching doesn't always have to operate on $_, although this default behavior is quite convenient. A special operator, =~, evaluates to either true or false, depending on whether its first operand matches on its second operand. So $filename =~ /dat$/ is true if $filename matches on /dat$/. ~, has the opposite sense. ~ /perl/ && warn "Not sure if perl is in your path "; Alternative Delimiters The match operator can use characters other than //-a useful point if you're trying to match a complex expression that involves forward slashes.

Returning Values Perl is just as casual about returning values from subroutines as it is about passing arguments to them. A subroutine returns a single value: the value of the last assign-ment made in the subroutine. If you pass (4, 3) to this subroutine, the value 7 is returned: sub AddIt { ( $a, $b ) = @_; $a + $b; } That means that the value 7 is substituted for the subroutine call after evaluation. \n"; prints the following: Summing 4 and 3 yields 7. Notice that we had to keep the subroutine call outside the quotes to allow Perl to recognize & as a subroutine invocation.

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