Error levels for common PHP function errors

In PHP, the error level determines the severity and handling of the error. Common error levels include: E_WARNING: Warning, which does not necessarily stop script execution. E_NOTICE: Notification, less severe than E_WARNING. E_ERROR: Fatal error that will stop script execution. E_PARSE: Syntax error, will stop the script before it is executed. E_COMPILE_ERROR: The PHP compiler cannot compile the script and will stop the script before it is executed. E_CORE_ERROR: Error in PHP core that will stop the script before it is executed. E_USER_ERROR: A custom error raised by the trigger_error() function that can stop script execution.

Error levels of common errors in PHP functions

In PHP, the error level determines the severity and handling of the error. Understanding what the different error levels mean is critical to properly debugging and handling errors.

The following are some common PHP function error levels:

E_WARNING

• Error level: 2
• Description: A warning does not necessarily stop execution of the script, but indicates a potential problem.

E_NOTICE

• Error level: 8
• Description: A less severe notification than E_WARNING, usually does not affect scripts execution.

E_ERROR

• Error level: 1
• Description: Indicates a fatal error that will stop the execution of the script.

E_PARSE

• Error level: 4
• Description: Indicates a syntax error that will stop the script before it is executed.

E_COMPILE_ERROR

• Error level: 16
• Description: Indicates that the PHP compiler cannot compile the script and will execute it before the script is executed. Stop the script.

E_CORE_ERROR

• Error level: 64
• Description: Indicates an error in the PHP core that will stop before script execution script.

E_USER_ERROR

• Error level: 256
• Description: Triggered by the trigger_error() function Custom errors can stop script execution.

Practical case:

The following code shows how to handle different error levels:

<?php

// 记录错误
ini_set('display_errors', 1);
ini_set('error_reporting', E_ALL ^ E_NOTICE);

// 触发一个警告
echo "警告消息";

// 触发一个错误
if (false) {
    echo "错误消息";
}

?>

Output:

警告消息
 PHP Fatal error:  Uncaught Error: Division by zero in ...

In this case, E_WARNING is a non-fatal warning and the script continues execution. E_ERROR, on the other hand, is a fatal error that causes the script to stop executing.

Note:

• The error level can be set through the error_reporting() function.
• Some PHP versions may support additional error levels.
• Handling error levels correctly is important for writing robust and maintainable PHP code.

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