How to fix '500 Internal Server Error' while running PHP

Problem

Visitors to your web site receive “500 Internal Server Error” messages when they access a page that uses PHP.

Resolution

PHP is installed as a CGI binary on nearly all of our servers. Internal server issues may arise as a consequence of executing PHP as a CGI binary if the permissions on files and directories are not specified appropriately. Another reason for internal server issues could be specific PHP directives provided in a.htaccess file.

If your web site is experiencing internal server errors, the first thing you should do is check the server logs. The server logs provide valuable information about which files are causing the errors, and potential causes. If you have a shared hosting account, you can view your web site’s error logs in cPanel. If you have a VPS or dedicated server, you can view your web site’s log files directly at the following paths:

• /usr/local/apache/logs/error_log
• /usr/local/apache/logs/suphp_log

Set correct permissions

If permission settings are causing internal server errors, you may see entries in the server logs similar to any of the following lines:

SoftException in Application.cpp:357: UID of script "/home/username/public_html/.htaccess" is smaller than min_uid

SoftException in Application.cpp:146: Mismatch between target UID (511) and UID (510) of file "/home/username/public_html/index.php"

SoftException in Application.cpp:256: File "/home/username/public_html/index.php" is writeable by others

These errors are all caused by permission issues. The first two lines indicate that the file’s owner or group is set incorrectly. For example, if the owner of a PHP file is the nobody or root account instead of your user account, visitors receive an internal server error when they try to view the page. If you have a shared hosting account, our Guru Crew can change the owners and groups for your files. If you need further assistance, please open a support ticket with our Guru Crew on the Customer Portal at https://hostvento.com.

The index.php file’s file permissions are too lenient, as the third line suggests. For instance, anyone can read, write, and execute a file or directory on your website if its rights are set to 777 (full permissions). Additionally, when trying to see the website, users get an internal server error. Set the permissions to 644 for files and 755 for directories to fix this issue. For instance, enter the following commands to set the proper rights for all files and directories in the public_html directory:

Copycd public_html
find . -type d -exec chmod 755 {} \;
find . -type f -exec chmod 644 {} \;

Do not change permissions on the public_html directory itself! Doing so may make your web site inaccessible.

Check .htaccess directives

Servers that run PHP as a CGI binary cannot use the php_flag or php_value directives in an .htaccess file. If directives in an .htaccess file are causing internal server errors, you will see entries in the server logs similar to the following line:

/home/username/public_html/.htaccess: Invalid command 'php_flag', perhaps misspelled or defined by a module not included in the server configuration

To resolve this problem, you must place any PHP directives into a custom php.ini file on your account, and remove or comment out any PHP directives in the .htaccess file. For information about how to set up a custom php.ini file, please see this article.

Also Read

Setting the PHP include path

How to fix ‘500 Internal Server Error’ while running PHP

PostgreSQL development