How to debug third-party library problems in PHP functions?

Methods to debug third-party library problems in PHP include: printing error information (echo $error->getMessage()), setting breakpoints to view variable values ​​and checking the error stack ($error->getTrace()) Enable PHP debugging (display_errors = On)

How to debug third-party library problems in PHP functions?

Introduction:

In PHP development, using third-party libraries can greatly improve efficiency, but sometimes these libraries can also cause problems. This article explains how to debug problems in third-party libraries so that you can more easily find and fix them.

Debugging strategy:

1. Print error message:

   • Use echo $error->getMessage() Print error message.
   • If the error message does not provide valuable information, you can use $error->getTrace() to obtain the error stack.

2. Set breakpoints:

   • Set breakpoints in your code to pause execution when an error occurs.
   • View the value of the variable and check whether it is consistent with expectations.

3. Enable PHP debugging:

   • Set display_errors in php.ini =On.
   • This will display a friendly error message when an error occurs.

Practical case:

Suppose we encounter the following error when using the third-party library MyLibrary:

Fatal error: Uncaught TypeError: Argument 1 passed to MyLibrary\Foo::bar() must be of the type string, null given...

Follow the steps introduced in this article, we debug:

1. Print error message:

   echo $error->getMessage();

2. Set a breakpoint:

   • Set a breakpoint in the MyLibrary\Foo::bar() function.
   • Check the argument passed to the bar() function and make sure it is of the expected type.

3. Enable PHP debugging:

   • Set display_errors in php.ini =On.

Through these steps we found that the error stemmed from not passing a string value to the $bar() function. After correcting the parameter types, the error was resolved.

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