Get constants related to error handling such as E_ALL, E_ERROR, etc.

Error handling is a crucial part in PHP, which allows developers to catch and handle errors to ensure the robustness and stability of their programs. PHP provides a variety of error-level constants, such as E_ALL , E_ERROR , E_WARNING , etc. These constants control the reporting level of different types of errors. You can use these constants to set the level of error reporting, or adjust how errors are handled in specific situations.

The get_defined_constants function is provided in PHP, which can return all defined constants in the current environment. With this function, you can easily view all the constants related to error handling in PHP, such as E_ALL , E_ERROR , etc. This article will explain how to use the get_defined_constants function to get these constants and process them.

1. What is the get_defined_constants function?

The get_defined_constants function is a built-in function in PHP that returns all defined constants in the current PHP environment. The syntax of this function is very simple:

 get_defined_constants(bool $categorize = false): array

• The $categorize parameter is optional. If set to true , the function returns an array containing the constant classification. If set to false , a simple array of all constants is returned.

2. Get constants related to error handling

To get constants related to error handling, such as E_ALL , E_ERROR , etc., first, we need to call the get_defined_constants function, and then filter out all error handling related constants in the result. Here is a sample code:

 <?php
// Get all defined constants
$constants = get_defined_constants(true);

// Filter out constants related to error handling
$error_constants = $constants['Core']; // Get PHP nuclear