When the results of your code are not what you expect, you need to start debugging and troubleshooting. The key is to obtain as much information as possible. Debug commands can be used to check the value of variables or even to see what values are returned from a MySQL call. This video reviews the common commands such as echo, print_r and gettype as well as some newer functions like var_dump, get_defined_vars and debug_backtrace. In addition, there is a short overview of third-party debuggers.
- View Offline
- Exercise Files
In the last movie, we looked at the warnings and errors that PHP generates. …But often, we need to debug our code, even when we aren't getting a PHP error. …We just aren't getting the results that we expected from our code. …Maybe a condition that uses less than ought to be using less than or equal to. …Or maybe we put code outside of a loop that ought to be inside the loop. …As with errors the more information we have about a problem, the easier it'll be …to solve it. And the best way for us to get more …information is to output that information to the HTML page as our code is running. …Now sure this extra output is going to make the page ugly while we're debugging …but that's okay because we're not planning to keep it.…
It's just temporary. There are a number of ways we can out put …useful information and we've seen three of them already. …The first one is super simple, we just echo the value of the variable. …If you're wondering what the value of x is each time it goes through a loop just …
- What is PHP?
- Installing and configuring PHP and MySQL
- Exploring data types
- Controlling code with logical expressions and loops
- Using PHP's built-in functions
- Writing custom functions
- Building dynamic webpages
- Working with forms and form data
- Using cookies and sessions to store data
- Connecting to MySQL with PHP
- Creating and editing database records
- Building a content management system
- Adding user authentication
Skill Level Beginner
PHP with MySQL Beyond the Basicswith Kevin Skoglund10h 26m Intermediate
1. PHP Overview
2. Mac Installation
3. Windows Installation
4. First Steps
5. Exploring Data Types
6. Control Structures: Logical Expressions
7. Control Structures: Loops
8. User-Defined Functions
10. Building Web Pages with PHP
11. Working with Forms and Form Data
12. Working with Cookies and Sessions
13. MySQL Basics
14. Using PHP to Access MySQL
15. Building a Content Management System (CMS)
16. Using Site Navigation to Choose Content
17. Application CRUD
18. Building the Public Area
19. Regulating Page Access
Next steps2m 4s
- Mark as unwatched
- Mark all as unwatched
Are you sure you want to mark all the videos in this course as unwatched?
This will not affect your course history, your reports, or your certificates of completion for this course.Cancel
Take notes with your new membership!
Type in the entry box, then click Enter to save your note.
1:30Press on any video thumbnail to jump immediately to the timecode shown.
Notes are saved with you account but can also be exported as plain text, MS Word, PDF, Google Doc, or Evernote.