PHP.ini settings

Last updated 2nd June 2022


There are two ways to customize php.ini values for your application. The recommended method is to use the variables property of to set ini values using the php prefix. For example, to increase the PHP memory limit you'd put the following in

        memory_limit: "256M"

It's also possible to provide a custom php.ini file in the repository in your app root.

; php.ini
; Increase PHP memory limit
memory_limit = 256M

Another example is to set the timezone of the PHP runtime (though, the timezone settings of containers/services would remain in UTC):

        date.timezone: "Europe/Paris"


; php.ini
; Set PHP runtime timezone
date.timezone = "Europe/Paris"

Environment-specific php.ini configuration directives can be provided via environment variables separately from the application code. See the note on environment variables.

Disabling functions

A common recommendation for securing a PHP installation is to disable certain built-in functions that are frequently used in remote attacks. By default, Web PaaS does not disable any functions as they all do have some legitimate use in various applications. However, you may wish to disable them yourself if you know they are not needed. For example, to disable pcntl_exec and pcntl_fork (which are not usable in a web request anyway):

        disable_functions: "pcntl_exec,pcntl_fork"

Common functions to disable include:

  • create_function - create_function has no useful purpose since PHP 5.3 and should not be used, ever. It has been effectively replaced by anonymous functions.
  • exec,passthru,shell_exec,system,proc_open,popen - These functions all allow a PHP script to run a bash shell command. That is rarely used by web applications, although build scripts may need them.
  • pcntl_exec,pcntl_fork,pcntl_setpriority - The pcntl_* functions (including those not listed here) are responsible for process management. Most of them will cause a fatal error if used within a web request. Cron tasks or workers may make use of them, however. Most are safe to disable unless you know that you are using them.
  • curl_exec,curl_multi_exec - These functions allow a PHP script to make arbitrary HTTP requests. Note that they are frequently used by other HTTP libraries such as Guzzle, in which case you should not disable them.
  • show_source - This function shows a syntax highlighted version of a named PHP source file. That is rarely useful outside of development.

Naturally if your application does make use of any of these functions, it will fail if you disable them. In that case, do not disable them.

Default php.ini settings

The default values for some frequently modified php.ini settings are listed below.

  • memory_limit=128M
  • post_max_size=64M
  • upload_max_filesize=64M
  • display_errors=On

    This value is on by default to ease setting up a project on Web PaaS. We strongly recommend providing a custom error handler in your application or setting this value to Off before you make your site live. * zend.assertions=-1

    Assertions are optimized out of existence and have no impact at runtime. You should have assertions set to 1 for your local development system. * opcache.memory_consumption=64

    This is the number of megabytes available for the OPcache. Large applications with many files may want to increase this value. * opcache.validate_timestamps=On

    The OPcache will check for updated files on disk. This is necessary to support applications that generate compiled PHP code from user configuration. If you are certain your application does not do so then you can disable this setting for a small performance boost.

We do not limit what you can put in your php.ini file, but many settings can break your application. This is a facility for advanced users.

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