This link has more information: https://en.wikipedia.org/wiki/Magic_number_(programming)#Debug_values * 0xABABABAB : Used by Microsoft’s HeapAlloc() to mark “no man’s land” guard bytes after allocated heap memory * 0xABADCAFE : A startup to this value to initialize all free memory to catch errant pointers * 0xBAADF00D : Used by Microsoft’s LocalAlloc(LMEM_FIXED) to mark uninitialised allocated heap memory * … Read more
You’re looking at the wrong place. These console messages do not appear in the web page, but in the invisible background page (ManifestV2) or service worker (ManifestV3). To view the correct console open devtools for the background script’s context: Visit chrome://extensions/ or right-click the extension icon and select “Manage extensions”. Enable developer mode Click on … Read more
Firebug is one of the most popular tools for this purpose.
In simple terms, a stack trace is a list of the method calls that the application was in the middle of when an Exception was thrown. Simple Example With the example given in the question, we can determine exactly where the exception was thrown in the application. Let’s have a look at the stack trace: … Read more
For syntax errors, you need to enable error display in the php.ini. By default these are turned off because you don’t want a “customer” seeing the error messages. Check this page in the PHP documentation for information on the 2 directives: error_reporting and display_errors. display_errors is probably the one you want to change. If you … Read more
A debugger is a program that can examine the state of your program while your program is running. The technical means it uses for doing this are not important for understanding the basics of how to use a debugger. You can use a debugger to halt the execution of your program when it reaches a … Read more
This answer describes the process of retrieving the stack trace. Already have the stack trace? Read up on stack traces in “What is a stack trace, and how can I use it to debug my application errors?” The Problem Your application quit because an uncaught RuntimeException was thrown. The most common of these is the … Read more
When you write a “string” in your source code, it gets written directly into the executable because that value needs to be known at compile time (there are tools available to pull software apart and find all the plain text strings in them). When you write char *a = “This is a string”, the location … Read more
Warning: Cannot modify header information – headers already sent Happens when your script tries to send an HTTP header to the client but there already was output before, which resulted in headers to be already sent to the client. This is an E_WARNING and it will not stop the script. A typical example would be … Read more
What are the syntax errors? PHP belongs to the C-style and imperative programming languages. It has rigid grammar rules, which it cannot recover from when encountering misplaced symbols or identifiers. It can’t guess your coding intentions. Most important tips There are a few basic precautions you can always take: Use proper code indentation, or adopt … Read more