Skip to main content

🚀 In our NEW AI Bootcamp you'll build a working app in 28 days, no experience required. Free to all subscription levels.

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

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

  • Treehouse Logo
    • For Individuals
    • For Businesses
    • For Schools
    • For Libraries
    • For Military
    • All Courses
    • Tracks
    • AI Bootcamp
    • College Credit
    • Techdegree Bootcamps
    • Front End Development
    • Full Stack JavaScript
    • Code Adventures
    • Discord
    • Forum
    • Success Stories
    • Treehouse Links
    • 100 Days of Code
    • Explore
    • Career Toolbox
    • Free Treehouse Near Me
    • Affiliates
    • Blog
    • Support
    • About
    • Learn
    • Beginner's Guide to Coding
    • Data Analysis with SQL & Python
    • Front-End Web Development
    • Python Programming Basics
    • Techdegree Bootcamp Overview
    • UX Design Fundamentals
    • AI Tools for Beginners
  • For Individuals For Businesses For Schools For Libraries For Military
  • All Courses Tracks AI Bootcamp College Credit
  • Techdegree Bootcamps Front End Web Development Full Stack JavaScript
  • Code Adventures Discord Forum Success Stories Treehouse Links 100 Days of Code
  • Explore Career Toolbox Free Treehouse Near Me Affiliates Blog Support About
    Learn Beginner's Guide to Coding Data Analysis with SQL & Python Front-End Web Development Python Programming Basics Techdegree Bootcamp Overview UX Design Fundamentals AI Tools for Beginners
  • Sign In
  • Free Trial
Instagram Twitter Facebook YouTube LinkedIn
Loading banner... Start your free trial at Treehouse
    • Newest
      • Newest
      • Active
      • Unanswered
      • Featured
    • All Topics
      • All Topics
      • • General Discussion
      • • AI
      • • 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
      • • Vibe Coding
  • anthonybrackner
    anthonybrackner
    17,776 Points

    Why am I getting an error on line 5 of this code?

    Posted July 12, 2018 12:27am by anthonybrackner
    anthonybrackner
    17,776 Points
    • PHP
    • PHP Arrays and Control Structures
    • PHP Arrays
    • Multidimensional Arrays

    2 Answers

  • A X
    A X
    12,842 Points

    Not Understanding What a Multi-Dimensional Array is or What it does.

    Posted February 5, 2017 6:46pm by A X
    A X
    12,842 Points
    • PHP
    • PHP Arrays and Control Structures
    • PHP Arrays
    • Multidimensional Arrays

    4 Answers

  • Santis Smagars
    Santis Smagars
    980 Points

    Complain

    Posted December 29, 2016 9:29am by Santis Smagars
    Santis Smagars
    980 Points
    • PHP
    • PHP Arrays and Control Structures
    • PHP Arrays
    • Multidimensional Arrays

    6 Answers

  • abcd efgh
    abcd efgh
    824 Points

    Doesn't the array list[] get overwritten by using it twice?

    Posted September 16, 2016 1:02pm by abcd efgh
    abcd efgh
    824 Points
    • PHP
    • PHP Arrays and Control Structures
    • PHP Arrays
    • Multidimensional Arrays

    1 Answer

  • Hazem mosaad
    Hazem mosaad
    15,384 Points

    why this not work in multi dimes. challenge ?

    Posted August 20, 2016 2:28am by Hazem mosaad
    Hazem mosaad
    15,384 Points
    • PHP
    • PHP Arrays and Control Structures
    • PHP Arrays
    • Multidimensional Arrays

    7 Answers

  • Thad Roe
    Thad Roe
    10,687 Points

    Completed the Multidimensonal array challenge, but still don't think I did it right

    Posted August 16, 2016 1:22pm by Thad Roe
    Thad Roe
    10,687 Points
    • PHP
    • PHP Arrays and Control Structures
    • PHP Arrays
    • Multidimensional Arrays

    1 Answer

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

Techdegree

  • Front End Web Development
  • Full Stack JavaScript
SEE ALL

Tracks

  • Learn to Code for Beginners
  • Beginning Python
  • Beginning SQL
  • Beginning Java
SEE ALL

Courses

  • JavaScript Basics
  • Intro to HTML & CSS
  • Python Basics
  • CSS Layout
SEE ALL

About Us

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

Explore

  • Plans
  • Affiliates
  • Perks
  • Shop
  • Free Treehouse Near Me
  • Treehouse for Libraries
  • Treehouse for Businesses

Treehouse is an online technology education platform founded in 2011. Treehouse offers more than 700 self-paced, video-based courses in web development, programming, data analysis, design, and AI, plus two project-based bootcamp programs in Front End Web Development and Full Stack JavaScript. Individual Treehouse plans start at $25 per month and include a 7-day free trial. Treehouse serves individual learners, businesses, schools, and public libraries. Cardholders at participating U.S. public libraries can use Treehouse for free. Select Treehouse courses, offered with University Pathways International, are recommended for college credit by ACE and NCCRS. Treehouse learners earn digital certificates for completed Tracks.

Terms & Conditions · Privacy · © 2026 Treehouse Island, Inc.
  • Twitter
  • YouTube
  • Facebook
  • LinkedIn
  • Instagram
  • Discord