🤑 Join the Treehouse affiliate program and earn 25% recurring commission!

New No-Code Track! 🚀start learning today!

🌟 Dreaming of a bright future? 🎓 Ask about the Treehouse Scholarship program! 🚀

✨ Earn college credits in Cybersecurity, JS, HTML, CSS and Python

  • Treehouse Logo
  • Plans
    Chevron
    • For Individuals
    • For Businesses
    • For Schools
    • For Libraries
    • For Military
  • Library
    Chevron
    • All Courses
    • Tracks
    • College Credit
  • Techdegree
    Chevron
    • Overview
    • Front End Development
    • Full Stack JavaScript
    • Data Analysis
    • UX Design
    • Python
  • Community
    Chevron
    • Code Adventures
    • Discord
    • Forum
    • Success Stories
    • Treehouse Links
    • 100 Days of Code
  • Resources
    Chevron
    • Career Toolbox
    • CodeForward
    • Free Treehouse Near Me
    • Jobs
    • Blog
    • Support
    • About
  • For Individuals For Businesses For Schools For Libraries For Military
  • All Courses Tracks College Credit
  • Overview Front End Web Development Full Stack JavaScript Python Development Data Analysis UX Design
  • Code Adventures Discord Forum Success Stories Treehouse Links 100 Days of Code
  • Career Toolbox CodeForward Free Treehouse Near Me Jobs Blog Support About
  • Sign In
  • Free Trial
Instagram Twitter Facebook YouTube LinkedIn
    • Newest
      • Newest
      • Active
      • Unanswered
      • Featured
    • All Topics
      • All Topics
      • • General Discussion
      • • AI
      • • Android
      • • APIs
      • • Coding for Kids
      • • College Credit
      • • Computer Science
      • • CSS
      • • Data Analysis
      • • Databases
      • • Design
      • • Development Tools
      • • Digital Literacy
      • • Game Development
      • • Go Language
      • • HTML
      • • Java
      • • JavaScript
      • • Learning Resources
      • • Machine Learning
      • • No-Code
      • • PHP
      • • Professional Growth
      • • Python
      • • Quality Assurance
      • • React
      • • Ruby
      • • Security
      • • Swift
  • Shazad Kazi
    Shazad Kazi
    10,758 Points

    At 5:29, shouldn't the code run 21 times as you are starting with 0 and going to 20 inclusive.

    Posted June 22, 2016 3:53pm by Shazad Kazi
    Shazad Kazi
    10,758 Points
    • PHP
    • PHP Basics (Retired)
    • PHP Conditionals & Loops
    • For Loops

    2 Answers

  • jinhwa yoo
    jinhwa yoo
    10,042 Points

    I have a question if you tell me define("USE_FULL_NAME", TRUE); define("MAX_BADGES", 20); define--->???

    Posted May 16, 2016 12:54am by jinhwa yoo
    jinhwa yoo
    10,042 Points
    • PHP
    • PHP Basics (Retired)
    • PHP Conditionals & Loops
    • For Loops

    2 Answers

  • Ben Os
    Ben Os
    20,008 Points

    php: I have no idea why I get a "Unidentified variable" error here, plus an infinite loop...

    Posted January 23, 2016 10:03pm by Ben Os
    Ben Os
    20,008 Points
    • PHP
    • PHP Basics (Retired)
    • PHP Conditionals & Loops
    • For Loops

    4 Answers

  • Seth Warner
    Seth Warner
    5,348 Points

    So why is he typing <li>. I know what it is but wouldn't it print 11 22 33 44 55 66, etc since he is adding a list?

    Posted September 25, 2015 10:22pm by Seth Warner
    Seth Warner
    5,348 Points
    • PHP
    • PHP Basics (Retired)
    • PHP Conditionals & Loops
    • For Loops

    3 Answers

  • Darrell Conklin
    seal-mask
    .a{fill-rule:evenodd;}techdegree
    Darrell Conklin
    Python Development Techdegree Student 22,377 Points

    Undefined Variable

    Posted August 13, 2015 5:20pm by Darrell Conklin
    .a{fill-rule:evenodd;}techdegree
    Darrell Conklin
    Python Development Techdegree Student 22,377 Points
    • PHP
    • PHP Basics (Retired)
    • PHP Conditionals & Loops
    • For Loops

    1 Answer

  • Thanitsak Leuangsupornpong
    Thanitsak Leuangsupornpong
    7,490 Points

    Can we have more than 3 expression?

    Posted May 19, 2015 8:39am by Thanitsak Leuangsupornpong
    Thanitsak Leuangsupornpong
    7,490 Points
    • PHP
    • PHP Basics (Retired)
    • PHP Conditionals & Loops
    • For Loops

    4 Answers

  • Adam Tatusko
    Adam Tatusko
    16,589 Points

    PHP Loops

    Posted October 6, 2014 3:30am by Adam Tatusko
    Adam Tatusko
    16,589 Points
    • PHP
    • PHP Basics (Retired)
    • PHP Conditionals & Loops
    • For Loops

    2 Answers

  • Juice Creative
    Juice Creative
    3,857 Points

    php making image links using loops

    Posted August 19, 2014 3:23pm by Juice Creative
    Juice Creative
    3,857 Points
    • PHP
    • PHP Basics (Retired)
    • PHP Conditionals & Loops
    • For Loops

    2 Answers

Posting to the forum is only allowed for members with active accounts.
Please sign in or sign up to post.

    Treehouse

  • About
  • Blog
  • Careers
  • Community
  • Stories
  • Shop
  • Contact
  • Gift Card

See Full Catalogue

Techdegree

  • Front End Web Development
  • Full Stack JavaScript
  • Python Development
  • Data Analysis
  • UX Design

Tracks

  • Learn to Code for Beginners
  • Beginning Python
  • Beginning SQL
  • Beginning Java
  • ...see more

Courses

  • JavaScript Basics
  • Intro to HTML & CSS
  • Python Basics
  • CSS Layout
  • ...see more

Explore

  • Plans
  • Affiliates
  • Perks
  • Free Treehouse Near Me
  • Treehouse for Libraries
  • Treehouse for Businesses
  • Twitter
  • YouTube
  • Facebook
  • LinkedIn
  • Instagram
Terms & Conditions | Privacy

© 2025 Treehouse Island, Inc.