Error reporting and handling of PHP functions

In PHP, function errors are controlled through the error reporting level (E_ERROR, E_WARNING, etc.), which can be set using the error_reporting() function. Additionally, errors can be handled by try-catch blocks, where the try block contains the code to be executed and the catch block contains the error handling code. This mechanism ensures that errors are handled and meaningful feedback is provided during script execution.

Error reporting and handling of PHP functions

In PHP, when an error is encountered during function execution, the system will Generate an error report. We can control how these errors are displayed by changing PHP's error reporting level.

Error reporting levels

PHP defines the following error reporting levels:

• E_ERROR: Serious error. The script will terminate execution.
• E_WARNING: Runtime warning. The script continues execution.
• E_NOTICE: Runtime notification. The script continues execution.
• E_STRICT: Coding standards warning. The script continues execution.
• E_DEPRECATED: The function or feature has been deprecated. The script continues execution.

You can set the error reporting level through the error_reporting() function, as follows:

error_reporting(E_ALL); // 报告所有错误
error_reporting(E_ERROR | E_WARNING); // 只报告错误和警告

Error handling

In addition to changing the error reporting level, we can also use try-catch blocks to handle errors. The try block contains the code to be executed, while the catch block contains the code to handle the error.

try {
    // 可能会产生错误的代码
} catch (Exception $e) {
    // 处理错误
}

Practical case

Consider the following function, which converts a list of numbers into a string:

function listToString($list) {
    if (!is_array($list)) {
        throw new Exception("参数必须是数组");
    }

    return implode(",", $list);
}

If we call this function and pass in non array parameters, an error will occur. We can use a try-catch block to handle this error:

try {
    $result = listToString("Hello");
} catch (Exception $e) {
    echo $e->getMessage(); // 显示错误信息
}

This will output the following error message:

参数必须是数组

Through error reporting and handling, we can ensure that in the script Handle errors during execution and provide meaningful feedback to users.

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