How to output php error log file in nginx

Configuring Nginx

Add some configuration items to the Nginx configuration file to output PHP error log files. Normally, the Nginx configuration file on CentOS systems is saved in /etc/nginx/nginx.conf. Usually located at the top of the file, you can find the configuration section of the http module in the file and add the following configuration item:

http {
    ...
    server {
        ...
        location ~ \.php$ {
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            include        fastcgi_params;

            # error log
            fastcgi_param PHP_VALUE "error_log=/var/log/nginx/php_errors.log";
        }
        ...
    }
    ...
}

This configuration item will only be applied when the accessed URL ends with .php, that is, using location ~.php$. The address and port of the PHP FastCGI server are set in fastcgi_pass. fastcgi_param is used to set the parameters of PHP, where SCRIPT_FILENAME specifies the path and file name of the PHP script. To use the default FastCGI parameters, fastcgi_params needs to be included in Nginx. The last line adds fastcgi_param PHP_VALUE "error_log=/var/log/nginx/php_errors.log";, which means recording PHP error information to the /var/log/nginx/php_errors.log file.

Create a log file

Create a log file to record PHP error information. This is a step required after configuring Nginx. Assume that we want to save the log file to /var/log/nginx/php_errors.log. We can use the following command to create the file:

sudo touch /var/log/nginx/php_errors.log

Then use the following command to modify the owner and permissions of the file:

sudo chown nginx:nginx /var/log/nginx/php_errors.log
sudo chmod 644 /var/log/nginx/php_errors.log

Testing

When testing, you can create a PHP script and an error occurs, for example:

<?php
echo 1/0;
?>

Save this script as test.php, and then place it in In the web root directory of Nginx, for example /usr/share/nginx/html/test.php. When you visit http://localhost/test.php, you will find a PHP error. Then use the following command to view the contents of the log file:

sudo tail /var/log/nginx/php_errors.log

If everything is normal, you should see an error message similar to the following:

[17-Oct-2021 20:52:42 UTC] PHP Warning:  Division by zero in /usr/share/nginx/html/test.php on line 2

The above is the detailed content of How to output php error log file in nginx. For more information, please follow other related articles on the PHP Chinese website!