Platform Settings

Last updated on December 11th, 2020

configuration development media module php settings WordPress

This page offers answers to common questions about default platform settings, WordPress settings, and server configuration settings. You can use this as a quick reference for many settings and how they are configured or changed.

Table of Contents

1. WordPress Memory Limit

2. Maximum File Upload Size

3. PHP Image Resize Limit

8. Max Execution Time

9. Max Input Vars

10. Security Headers

10.1. Misc Security Headers

11. Server Modules

12. Disallowed Plugins

13. PHP Version

14. MySQL Version

15. mod_security

16. Configuration Files

17. WP Engine MU Plugins

WordPress Memory Limit

The default WordPress Memory Limit is 40MB for a single site, or 64MB for a Multisite network.

These values can be increased to a maximum of 512MB by inserting the following lines under the “WP Engine Settings” section in your wp-config.php file:

define( 'WP_MEMORY_LIMIT', '512M' );

If you want to define a separate higher or lower memory for the WordPress admin area of the site, can add the following line after the one above:

define( 'WP_MAX_MEMORY_LIMIT', '512M' );

WooCommerce recommends setting this value to at least 128MB. You are free to define whichever memory value works best for your site, as long as it does not exceed 512MB.

To make this edit you’ll need access to the file system of your website. Learn more about connecting to your website with SFTP, or the more advanced SSH gateway.

Maximum File Upload Size

The default maximum upload file size for sites is 50MB.

To increase max file upload size up to 200MB by contacting Support. Any files larger than 200MB must be uploaded via SFTP or SSH Gateway.

Max File Upload Size on Multisite

In addition to the above steps, you will also need to update the network upload size if you are using a WordPress multisite.

Login to your WordPress admin dashboard
Click My Sites
Select Network Admin
Click Settings
Locate Max upload file size
- Note that the size here is in KB

PHP Image Resize Limit

WP Engine limits the size of images that can resized using PHP. This size limit is 8000px by 8000px, or 40MP. We’ve put this limit in place to protect server memory and stability, and therefore it cannot be increased.

Plugins that resize images using PHP, such as Smush or ImageMagick, may run into errors if the image is too large. For example you may see the error, width or height exceeds limit. If you are seeing such an error, resize the image below the limitations prior to attempting the upload again.

Post Revisions

WordPress Post Revisions, or autosaves, store a record of each saved draft or published update for a post. This system allows a user to see the last few changes and to restore a page or post to a previous version.
While great in theory, revisions cause the database to grow exponentially and a large database can directly impact site performance.

Every WP Engine site has WordPress revisions disabled by default. It’s our recommendation to keep revisions disabled to assure optimal site performance and to use a separate editor for managing content prior to publishing.

Revisions can only be enabled by contacting Support. Revisions cannot be enabled in the wp-config.php or php.ini files, as this will be overwritten at the server level.

If you migrated a site with existing revisions that you would like to preserve, reach out to Support to have revisions enabled.

Support can help you enable 3 revisions for your posts to start. Revisions should not exceed 5.
Old revisions will be automatically removed after 60 days.

NOTE: Enabling revisions is not a retroactive change. Only revisions generated after the feature has been enabled will be stored moving forward.

If you would like to clean up your database and delete any existing database revisions, the following query can be run from phpMyAdmin.

DELETE FROM wp_posts WHERE post_type = “revision”;

Sending Email

WP Engine allows general WordPress emails such as password resets to be sent through WordPress below a certain reasonable quantity. However, for sending a large number of emails, such as a newsletter or email blast, we impose a limit and require the use of an email API or an SMTP plugin.

As Port 25 is blocked for all services, we highly recommend using an email service that sends email via API, or an alternative port (such as port 2525).

More information about WP Engine’s email policy can be found here.

TLS Version

All WP Engine servers have TLS 1.2 and 1.3 enabled by default.

TLS 1.0 and 1.1 will be deprecated on March 31st. As TLS 1.0/1.1 deprecation is happening across the industry, we will not be offering the option for customers to defer or opt into a version lower than TLS 1.2. For a majority of customers, an update to TLS 1.2+ should not cause any noticeable impact.

Check out our guide for more information about TLS and SSL.

GZIP Compression

WP Engine automatically uses GZIP compression to optimize performance of static files (like images, text files, JavaScript, and CSS) on your web server. As a result, GZIP directives are typically not needed in your .htaccess file. The following file types are automatically compressed by WP Engine with GZIP:

application/rss+xml
application/vnd.ms-fontobject
application/wasm
application/x-javascript
application/x-web-app-manifest+json
application/xhtml+xml
application/xml
application/xml+rss
font/otf
image/bmp
image/svg+xml
image/x-icon
text/cache-manifest
text/calendar
text/css
text/javascript
text/log
text/markdown
text/plain
text/richtext
text/vcard
text/vnd.rim.location.xloc
text/vtt
text/x-component
text/x-cross-domain-policy
text/xml
text/xsd
text/xsl

Max Execution Time

Default max_execution_time for scripts is set to 60 seconds.

This setting can only be decreased, and cannot be increased. If you are performing a task which will take over 60 seconds to complete, the task should be broken into smaller segments and run in batches.

Max Input Vars

The default max_input_vars setting is 10000, indicating no more than 10,000 variables can be attached to any request. This setting cannot be adjusted, as this is set at a platform level and higher values will have negative performance implications.

NOTE: PHP 7.4 does not support .htaccess. Review our guide for alternatives.

Security Headers

If you want to ensure extra security on your site through the use of headers, many are already added by default. If the header you’d like is not enabled automatically, they can be requested by reaching out to WP Engine Support.

CORS

Cross-Origin Resource Sharing headers are defined by default for all static resources on sites (images, styles, JavaScript, etc). You can see this by curling for the headers on a static file. For example:

As these are set by default, they should not need modifications. If you require changes, reach out to Support.

HSTS

HTTP Strict Transport Security (HSTS) is a security policy allowing web servers to declare that browsers (or other complying user agents) should only interact with it using secure HTTPS connections.

Setting this up on WP Engine requires reaching out to WP Engine Support and requesting the following Nginx rule be added:

add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload";

HSTS setup must then be completed at: https://hstspreload.org/ On this page, you’ll need to use the root domain (non-www) and not the www domain.

If there is an error with the verification, make sure that no domain-level redirects are set in the User Portal. For example, non-www to www or vice versa. Any redirects from the root domain must be removed completely.

Misc Security Headers

The following security headers can also be added by request to Nginx by WP Engine Support. We’ve included examples of the most common header options, but many can be modified to suit your specific needs.

Vary

Ensures the correct content is delivered for the specific browser. This is particularly relevant when caching or proxy layers are at play, as older browsers may not understand more modern compression or file types. The following is the recommended rule configuration.

proxy_set_header X-WPE-Vary "Accept-Encoding";

X-XSS Protection

Protects (typically older) browsers from cross-site scripting attacks. The following is the recommended configuration rule.

add_header X-XSS-Protection "1; mode=block";

Feature Policy

Allows opt-in and opt-out standardization for features on a website, particularly when APIs or third-party apps are used. The following is a usable example but it can be modified if necessary.

add_header Feature-Policy "geolocation 'none';midi 'none';notifications 'none';push 'none';sync-xhr 'none';microphone 'none';camera 'none';magnetometer 'none';gyroscope 'none';speaker 'self';vibrate 'none';fullscreen 'self';payment 'none';";

Referrer-Policy

Identifies the address of the webpage associated with a requested resource. The following is a usable example but can be modified for different needs.

add_header Referrer-Policy "origin" always;

X-Content-Type-Options

Allows deliberate setting of MIME types by forcing requests to follow and not change the set content-type. Learn more about this header on Mozilla.

add_header X-Content-Type-Options "nosniff" always;

X-Frame-Options

Determines whether or not a page can be loaded as a <frame>, <iframe>, <embed> or <object>. The following tells the page that it can only be displayed as one of these types on a page with the same origin. This rule can be modified to allow other URIs if needed.

add_header X-Frame-Options "SAMEORIGIN" always;

Server Modules

WP Engine has a specific set of platform-wide server modules which cannot be modified, removed, or added. To see a full list of modules, versions, and default settings, you can create a PHP Info file.

Disabled Functions and Modules

Our system administrators have already pre-configured server settings to best suit the needs of the majority of our clients. Some functions cannot be modified from site to site or in the php.ini file as they are configured at a server level.

Here are some functions that have been disabled and therefore are not able to be altered:

apache_child_terminate
apache_get_modules
apache_get_version
apache_getenv
apache_note
apache_setenv
disk_free_space
disk_total_space
diskfreespace
dl
exec
flock()
passthru
pclose
pcntl_exec
popen
posix_getpwuid
posix_kill
posix_mkfifo
posix_setpgid
posix_setsid
posix_setuid
posix_uname
proc_close
proc_get_status
proc_nice
proc_open
proc_terminate
shell_exec
show_source
system
opcache_get_configuration
opcache_get_status
auto_prepend_file

Miscellaneous Modules

Module	Is it installed?
ionCube Loader	No
cURL support	Yes
SOAP client	Yes
Imagick	Yes

Disallowed Plugins

Most plugins are allowed on the WP Engine platform, however a handful of plugins we specifically disallow, as they will cause issues with either security or performance.

View our current list of disallowed plugins.

Although they are not disallowed, some plugins are still incompatible with the WP Engine platform. This is most impactful for plugins and themes utilizing ionCube. The ionCube Loader module is not available on WP Engine due to the significant performance issues it causes.

Learn more about unsupported modules.

PHP Version

PHP Versions are regularly released and deprecated. To see which versions are currently available on the WP Engine farm and how to change versions, check out our PHP Upgrade Guide.

MySQL Version

WP Engine uses MySQL 5.6 and MySQL 5.7. New Digital Experiences will be placed on MySQL 5.7. To learn which MySQL version you are on, please contact Support.

mod_security

WP Engine does not use the mod_security Web Application Firewall (WAF) with Apache. Instead, we use a proprietary traffic detection and blocking system among other enterprise-grade security measures. This firewall will automatically block IPs or User Agents based on a predetermined set of rules.

If you’d like to manually block an IP, User Agent or country on this firewall, reach out to our Support team for assistance.

Configuration Files

There are several site and server-wide configuration files in place for each environment. Some files are accessible and able to be modified, while others are not.

Configuration file	Is it editable?
php.ini file	No. Server-wide PHP settings are unable to be changed.
.htaccess file	Not recommended. PHP versions 7.4 and up will not read the .htaccess file. Refer to our guide for more information.
wp-config.php file	Yes. This file can be edited, but there are many WP Engine-specific settings in this file which should not be changed. For the best results, put custom entries in the “WP Engine Settings” section at the bottom.
nginx.conf file	No. Server or site-specific Nginx settings are not able to be adjusted. If there is a specific Nginx setting you wish to adjust, please contact Support to see if there are any internal changes which may be made

WP Engine MU Plugins

There are certain must-use plugins that you may see added to your WordPress website by WP Engine. These are added for specific reasons, such as security or functionality.

While we don’t recommend it, some of these plugins can be disabled. If you’d like to remove a WP Engine MU plugin, reach out to our Support team.

WP Engine Common

The wpengine-common plugin provides most of the WP Engine platform functionality. Platform features provided by this plugin can be seen in your wp-admin dashboard under the WP Engine menu icon.

This plugin cannot be disabled, however the menu icon can be hidden with custom coding.

WP Engine Seamless Login

The wpe-wp-sign-on-plugin plugin files are added for the WP Engine “Seamless Login” feature. This feature gives you the ability to securely log in to the wp-admin of a website directly from the User Portal.

To learn more about this functionality see the Seamless Login guide.

WP Engine Security Auditor

The wpengine-security-auditor plugin performs two main functions:

Log security-relevant events to the Apache error log. Examples of logged events are login, role changes, and plugin upgrades.
Periodically calculate and log checksums for plugins, themes, and WP core files.

For a full list of these items as they display in your logs, see our guide.

We do not recommend disabling this plugin as it adds security features. However, if you find too many events are being logged it can be disabled by adding the following feature flag to your wp-config.php file:

define('WPENGINE_SECURITY_AUDITOR_ENABLED', false);

Force Strong Passwords

The plugin force-strong-passwords is added to force all users with access to the wp-admin are of your site to use strong passwords. Strong passwords are only required for Administrator, Editor, and Author roles. It is not required for “weaker” roles like Subscriber and Contributor. Our system to force a strong password only requires users to set a strong password when resetting the password from the wp-login.php page.

This plugin should never be disabled as it can create a serious security vulnerability in your website.

To learn more about forcing strong passwords, see our full guide.

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