What errors are caught in php exception handling?

The errors captured by php exception handling are: 1. Fatal error, which will cause the execution of the script to terminate immediately; 2. Serious error, which will cause the execution of the script to be terminated; 3. Exception handler, you can use try-catch Statement blocks to capture thrown exceptions; 4. Custom error handling functions, which provide some built-in error handling functions; 5. Error logging, in order to better track and debug errors.

The operating system of this tutorial: Windows10 system, PHP version 8.1.3, DELL G3 computer.

PHP is a very popular server-side scripting language that is widely used for web development. During the development process, it is inevitable to encounter errors, and exception handling is a common way to handle errors. PHP provides a rich exception handling mechanism that can capture and handle different types of errors. This article will introduce some common PHP exception handling errors.

1. Fatal Errors: This kind of error will cause the execution of the script to terminate immediately. Usually caused by syntax errors, wrong function calls, or calls to non-existent methods. If exception handling is not performed, PHP will directly output error information to the user, affecting the user experience.

2. Critical Errors: These errors will also cause the execution of the script to abort, but before aborting, the function registered with `shutdown_function` will be called. These errors include memory overflow, infinite recursion, etc. It is necessary to catch and handle these errors in the script by registering the `shutdown_function` function.

3. Exception Handlers: In PHP, you can use the try-catch statement block to catch thrown exceptions. The try block is used to execute code that may go wrong, and the catch block is used to catch and handle exceptions. If an exception occurs in the try block, the program will jump to the nearest catch block and execute the code in the catch block. By customizing exception classes, you can distinguish different types of exceptions and adopt different handling methods.

4. Custom Error Handlers: PHP provides some built-in error handling functions, such as `error_reporting` and `set_error_handler`. By calling the `error_reporting` function, you can set the error level reported during script execution. The `set_error_handler` function is used to set a custom error handling function. When an error occurs, this function will be called for processing.

5. Error Logging: In order to better track and debug errors, PHP provides an error logging function. By setting the `error_log` directive, error information can be recorded to the specified log file to facilitate subsequent analysis and processing by developers.

In summary, PHP provides a variety of exception handling methods to capture errors. Proper use of these mechanisms can make our applications more robust and stable. Whether capturing fatal errors, critical errors, or handling them through custom error handling functions, it helps improve development efficiency and user experience. At the same time, properly recording error logs can also help to quickly locate and solve problems.

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