phpredis session locking -- 获取锁失败抛出 php notice -- would like fatal error

Question

当使用 php redis 作为具有会话锁定的会话处理程序时，如果出现无法发生锁定的错误，则会抛出 php 通知并继续执行脚本。有没有办法将其配置为致命错误并且脚本根本不处理？

Answer 1

确保您遵循此文档声明：

Locking feature is currently only supported for Redis setup with single master instance

如果您仍然有一些问题，那么可以使用 set_error_handler 设置您自己的错误处理程序来快速修复整个应用程序，以解决该特定问题。下面的示例处理程序仅对使用未声明的变量做出反应。更改正则表达式模式，使其与您的 Redis 错误消息匹配。

<?php

error_reporting(E_ALL);

$redisNoticeFunction = function($errno, $errstr, $errfile, $errline, array $errcontext) {

    // is the error E_NOTICE?
    if ($errno === \E_NOTICE) {
            
        // if error was suppressed with the @-operator
        if (0 === \error_reporting()) {
            // do nothing, continue execution of script
            return;
        }
        
        // check if notice is about Redis
        $pattern = '/.*Undefined variable.*/'; // <== change pattern so it matches notice about Redis
        $subject = $errstr;
        $status = \preg_match($pattern, $subject);
        
        // if there was a problem with regex
        if (false === $status) {
            $msg = 'Could not perform preg_math with pattern: ' . $pattern . ' and subject: ' . $subject . \PHP_EOL;
            // exit by throwing an exception
            throw new \InvalidArgumentException($msg);
        }

        // if notice was about about Redis
        if ($status) {
            $error_msg = 'Redis locking problem with notice msg: ' . $errstr;
            $error_msg .= ' at ' . $errfile . ':' . $errline . \PHP_EOL;
            
            // signal fatal error
            $error_type = \E_USER_ERROR;
            \trigger_error ($error_msg, $error_type);
            
            // or throw exception (comment above line with \trigger_error())
            throw new \RuntimeException($error_msg);
        }

        // the notice was not related to the Redis
        // echo its message and continue script
        echo $errstr . \PHP_EOL;
        return;
    }

    // the error was not the E_NOTICE
    // do other error handling if needed

    // or just end the script
    die;

};

set_error_handler($redisNoticeFunction);    

echo @ $notDeclared; // does not end script

echo $notDeclared; // end script or throws an exception

最后一行

echo $notDeclared; // end script or throws an exception

脚本结束信息：

Fatal error: Redis locking problem with notice msg: Undefined variable: notDeclared at /tmp/index.php:59

set_error_handler 应该用在你的 php 脚本的开头（完全在一个通用文件中，像 bootstrap.php 一样到处都需要）

使用自己的错误处理程序的缺点是，如果您使用框架或其他包装代码，它可能已经设置了自己的错误处理程序，提供了一些有用的功能，例如调试，甚至错误处理程序可能是必不可少的框架错误处理、日志记录等

如果您希望恢复到原始错误处理程序（PHP 的默认值或您自己之前设置的错误处理程序），请使用 restore_error_handler

Answer 2

如果有人想知道将 session_lock 通知变成致命错误的确切代码；这里是。（如果没有其他答案我做不到，但这正是我使用的）

function redisNoticeFunction($errno, $errstr, $errfile, $errline, array $errcontext) 
{
    // is the error E_NOTICE?
    if ($errno === E_NOTICE) 
    {
        // if error was suppressed with the @-operator
        if (0 === error_reporting()) 
        {
            // do nothing, continue execution of script
            return;
        }
    
        // if notice was about about Redis locking
        if ($errstr == 'session_start(): Acquire of session lock was not successful') 
        {
            $error_msg = 'Redis locking problem with notice msg: ' . $errstr;
            $error_msg .= ' at ' . $errfile . ':' . $errline . \PHP_EOL;

            // signal fatal error
            $error_type = E_USER_ERROR;
            trigger_error ($error_msg, $error_type);
        }
        return;
    }
}

$current_error_reporting = error_reporting();
error_reporting(E_ALL);
set_error_handler('redisNoticeFunction');


session_start();
//Use regular error handling if session_start() does not end in a lock
restore_error_handler();
error_reporting($current_error_reporting);

phpredis session locking -- 获取锁失败抛出 php notice -- would like fatal error

phpredis session locking -- failing to get lock throws php notice -- would like fatal error

php

phpredis