Tips for handling PHP error suppressor errors and generating corresponding error prompts

Tips for handling PHP error suppressor errors and generating corresponding error prompts

Abstract: In PHP, the error suppressor (@) can be used to prevent the display of error messages. However, excessive use of error suppressors may make it difficult to track and resolve errors, so it is necessary to use them appropriately and generate corresponding error prompts. This article will introduce some tips for dealing with PHP error suppressor errors and provide code examples for reference.

Introduction:
When developing PHP applications, we often encounter various errors. In order to prevent these errors from having a negative impact on users, we will use the error suppressor (@) to prevent the display of error messages. However, if we overuse error suppressors, it can make errors difficult to track and resolve. Therefore, we need to use error suppressors reasonably and generate corresponding error prompts.

1. Use the error suppressor correctly
The error suppressor can add an @ symbol in front of the expression in the PHP code to suppress the error message. For example, if we want to open a file that does not exist, but do not want to display the relevant error message, we can use the following code:

<?php
@fopen("nonexistentfile.txt", "r");
?>

This code will try to open a file named "nonexistentfile.txt", but due to Added error suppressor, no error message will be displayed.

2. Generate corresponding error prompts
Although using error suppressors can prevent the display of error messages, we still hope to get relevant error prompts for better debugging and troubleshooting. In PHP, you can use the following methods to generate corresponding error prompts:

1. Use error handling functions (error handling functions)
   PHP provides some error handling functions, such as error_get_last(), trigger_error(), etc. can obtain error information and process it when an error occurs. We can add the following code to the code to get the error information:

   <?php
   $error = error_get_last();
   if ($error !== null) {
    // 根据错误类型生成对应的报错提示
    switch ($error['type']) {
        case E_ERROR:
            echo "发生致命错误：" . $error['message'];
            break;
        case E_WARNING:
            echo "发生警告：" . $error['message'];
            break;
        // 其他错误类型的处理...
    }
   }
   ?>

   After the error occurs, the above code uses the error_get_last() function to get the last error and generate the corresponding error message based on the error type. Error message.

2. Set error log (error logging)
   We can also write error information to the error log file for subsequent analysis and troubleshooting. You can use PHP's error_log() function to write error information to a file. We can add the following code to the code to record the error log:

   <?php
   error_reporting(E_ALL); // 打开所有错误报告
   ini_set("log_errors", 1); // 将错误信息写入日志文件
   ini_set("error_log", "error.log"); // 指定错误日志文件名称和路径
   
   @fopen("nonexistentfile.txt", "r");
   ?>

   The above code will write the error information to a file. Write to the log file named "error.log" to facilitate us to view and analyze errors.

Conclusion:
In PHP development, error suppressors should be used with caution and used reasonably as needed. At the same time, in order to better debug and troubleshoot, we can generate corresponding error prompts through error handling functions or error logging. Handling errors promptly helps improve the stability and reliability of PHP applications.

Reference code:

<?php
$error = error_get_last();
if ($error !== null) {
    // 根据错误类型生成对应的报错提示
    switch ($error['type']) {
        case E_ERROR:
            echo "发生致命错误：" . $error['message'];
            break;
        case E_WARNING:
            echo "发生警告：" . $error['message'];
            break;
    }
}

error_reporting(E_ALL); // 打开所有错误报告
ini_set("log_errors", 1); // 将错误信息写入日志文件
ini_set("error_log", "error.log"); // 指定错误日志文件名称和路径

@fopen("nonexistentfile.txt", "r");
?>

Reference link:

• PHP error handling function: https://www.php.net/manual/en/book.errorfunc .php
• PHP error logging: https://www.php.net/manual/en/errorfunc.configuration.php#ini.log-errors

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