CGI Programming 101 by Jacqueline D. Hamilton

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By Jacqueline D. Hamilton

Designed for clients who already understand how to construct an internet web page, this ebook demonstrates the thoughts for including courses known as universal Gateway Interfaces (CGIs) to their sites. Hands-on examples begin with absolutely the fundamentals comparable to the place to write down scripts, easy methods to add them and set dossier permissions, and the way to run them. extra complicated issues like processing types, studying and writing info records, and interacting with databases also are proven in transparent examples. additionally incorporated are tutorials on UNIX and the way to password-protect a website.

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Extra resources for CGI Programming 101

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You can divide the query string with Perl’s split function: my @values = split(/&/,$ENV{QUERY_STRING}); split lets you break up a string into a list of strings, splitting on a specific character. In this case, we’ve split on the “&” character. This gives us an array named @values containing two elements: ("fname=joe", "lname=smith"). We can further split each string on the “=” character using a foreach loop: foreach my $i (@values) { my($fieldname, $data) = split(/=/, $i); print "$fieldname = $data
\n"; } This prints out the field names and the data entered into each field in the form.

This gives us an array named @values containing two elements: ("fname=joe", "lname=smith"). We can further split each string on the “=” character using a foreach loop: foreach my $i (@values) { my($fieldname, $data) = split(/=/, $i); print "$fieldname = $data
\n"; } This prints out the field names and the data entered into each field in the form. It does not 35 Chapter Three CGI Environment Variables do URL-decoding, however. pm. pm to parse it. This requires that your query string be of the form: fieldname1=value1 For multiple values, it should look like this: fieldname1=value1&fieldname2=value2&fieldname3=value3 This will be the case if you are using a form, but if you’re typing the URL directly then you need to be sure to use a fieldname, an equals sign, then the field value.

You can divide the query string with Perl’s split function: my @values = split(/&/,$ENV{QUERY_STRING}); split lets you break up a string into a list of strings, splitting on a specific character. In this case, we’ve split on the “&” character. This gives us an array named @values containing two elements: ("fname=joe", "lname=smith"). We can further split each string on the “=” character using a foreach loop: foreach my $i (@values) { my($fieldname, $data) = split(/=/, $i); print "$fieldname = $data
\n"; } This prints out the field names and the data entered into each field in the form.

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