eXtropia: the open web technology company
Technology | Support | Tutorials | Development | About Us | Users | Contact Us
Resources
 ::   Tutorials
 ::   Presentations
Perl & CGI tutorials
 ::   Intro to Perl/CGI and HTML Forms
 ::   Intro to Windows Perl
 ::   Intro to Perl 5
 ::   Intro to Perl
 ::   Intro to Perl Taint mode
 ::   Sherlock Holmes and the Case of the Broken CGI Script
 ::   Writing COM Components in Perl

Java tutorials
 ::   Intro to Java
 ::   Cross Browser Java

Misc technical tutorials
 ::   Intro to The Web Application Development Environment
 ::   Introduction to XML
 ::   Intro to Web Design
 ::   Intro to Web Security
 ::   Databases for Web Developers
 ::   UNIX for Web Developers
 ::   Intro to Adobe Photoshop
 ::   Web Programming 101
 ::   Introduction to Microsoft DNA

Misc non-technical tutorials
 ::   Misc Technopreneurship Docs
 ::   What is a Webmaster?
 ::   What is the open source business model?
 ::   Technical writing
 ::   Small and mid-sized businesses on the Web

Offsite tutorials
 ::   ISAPI Perl Primer
 ::   Serving up web server basics
 ::   Introduction to Java (Parts 1 and 2) in Slovak

 

introduction to web programming
Cropping scalar variables with the chop function  
Sometimes, you do not want the entire value that has been assigned to a scalar variable. For example, it is often the case that the lines you retrieve from a data file will incorporate a new line character at the end of the line. Data files often take advantage of the new line character as a "database row delimiter". That is, every line in a database file is a new database item. For example, here is a snippet from an address book data file:

    Sol|Selena|sol@foobar.com|456-7890
    Birznieks|Gunther|gunther@foobar.com|456-7899

When the script reads each line, it also reads in the new line information. Thus, the first line is actually represented as:

    Sol|Selena|sol@foobar.com|456-7890\n

The final "\n" is a new line. Since we do not actually want the "\n" character included with the last database field, we use the chop function. The chop function chops off the very last character of a scalar variable using the syntax:

    chop ($variable_name);

Thus, we would take off the final new line character as follows:

    $database_row = "Sol|Selena|sol@foobar.com|456-7890\n";
    chop ($database_row);

Previous | Next | Table of Contents