在LAMP环境中，PHP错误默认指向下面这个文件。

/var/log/httpd/error_log

所有访问日志分为:

/var/log/httpd/access_log

你可以在下面看到一个帐户的php错误:

/home/username/logs/domain_tld.php.error.log

可以在全局和本地设置php错误日志。

Globally through WHM: WHM -->> MultiPHP INI Editor --> "Editor Mode" Select the version of PHP you would like to set the error log Edit the parameter error_log. error_log = "/some/path" Change the filename to the desired error log file Save changes Locally though cPanel: CPanel -->> MultiPHP INI Editor --> "Editor Mode" Select the version of PHP you would like to set the error log Edit the parameter error_log. error_log = "/some/path" Change the filename to the desired error log file Home directory will set the option for all domains, addons, and subdomains configured on the account A specific domain will limit the change to that domain, or, in the case of an addon domain, the addon and the matching subdomain Save changes If PHP-fpm is enabled: WHM --> MultiPHP Manager Find the domain you'd like to change the error log location for Click "Edit PHP-FPM" Change the log location in "The error log file (error_log)" relative to the folder "logs" within the user's home directory Save changes

如果您在谷歌计算引擎中，也可以是/var/log/apache2/error.log。

你可以这样看尾巴:

tail -f /var/log/apache2/error.log

在命令行中输入cat <file location> | grep ErrorLog在httpd.conf文件中查找ErrorLog。例如:

cat /etc/apache2/httpd.conf | grep ErrorLog

输出:

# ErrorLog: The location of the error log file.
# If you do not specify an ErrorLog directive within a <VirtualHost>
ErrorLog "/private/var/log/apache2/error_log"

找到以ErrorLog开头的行，这就是答案。

注意:对于虚拟主机，您可以编辑虚拟主机文件httpd-vhosts.conf以指定不同的日志文件位置。

无论你想要它在哪里，如果你在函数调用中设置它:

error_log($errorMessageforLog . "\n", 4, 'somePath/SomeFileName.som');

我可以向你保证，我不是唯一一个在沮丧地寻找日志文件时被逼疯过的人。看起来它应该是整个系统中最容易找到的东西。

关于PHP错误日志存储位置的明确指南将是一项复杂的工作。官方的PHP手册甚至没有尝试解决整个主题，因为PHP之外的系统存在依赖关系，例如操作系统(Linux vs. Windows, Linux的哪个发行版)，包括Windows和Linux中的设置，这些设置会影响PHP错误日志的名称和位置。

在有人花时间写一份完整的、跨系统的指南之前，你能得到的最好的是你可以查询的大致方向。每个PHP开发人员都不得不忍受这种追求带来的痛苦，只有一个例外。如果你在一个地方工作，信息是在你第一次需要的时候提供的，那么你永远都需要这些信息，也就是说，直到你找到一个新的工作环境。有这么幸运的人。

如果这些信息不是直接提供给你的，也就是说，你还有一些事情要做。在你的职业生涯中，寻找工作不是最漫长的，但也不是最简单的。

从已经发布的许多答案中可以明显看出，一个明智的开始是phpinfo()的输出。要查看它，创建一个包含以下内容的PHP文件:

<?php
    phpinfo();

Either browse to that file or run it from the command line. If you do both, you likely will find the error_log is in different places, depending on command line vs. web server use of PHP. That is because the PHP interpreter that runs on a web server is not the same PHP interpreter that runs from the command line, even when the command line is on the same machine as the web server. The answers already posted in here mostly are making an unstated assumption that PHP is running as part of a web server.

error_log的默认值是无值

无论值是什么，它都来自于用于配置PHP的PHP. ini文件。可以有很多php.ini文件。一开始在它们之间寻找方法是令人困惑的，但是您不需要处理这些来找到您的PHP日志。

如果phpinfo()的输出显示了一个文件的完整路径，那么这就是日志所在的位置。你真幸运。

诀窍在于phpinfo()中通常没有指定完整的路径。当没有完整路径时，位置取决于:

Whether error_log is no value. If it is, the log file location will depend on the operating system and the mode PHP is running. If PHP is running as an Apache module, on Linux the log often is in /var/log/apache2/error.log. Another likely spot is in a logs directory in your account home directory, ~/logs/error.log. If there is a file name without a path, the location depends on whether the file name has the value syslog. If it syslog, then the PHP error log is injected into the syslog for the server, which varies by Linux distribution. A common location is /var/log/syslog, but it can be anywhere. Even the name of the syslog varies by distribution. If the name without a path is not syslog, a frequent home for the file is is the document root of the website (a.k.a., website home directory, not to be confused with the home directory for your account).

这个小抄在某些情况下是有帮助的，但我很遗憾地承认它并不是万能的。我向你表示哀悼。