Help articles General Questions

What PHP functions are disabled?

Like many hosting providers, Flywheel disables a handful of PHP functions to help ensure secure and performant servers for all of our clients. Because we take security very seriously (and go to great lengths to protect Flywheel customers from malware), our settings are somewhat more locked down than most.

Here is the official list of functions that we disable:

pcntl_alarm
pcntl_fork
pcntl_waitpid
pcntl_wait
pcntl_wifexited
pcntl_wifstopped
pcntl_wifsignaled
pcntl_wexitstatus
pcntl_wtermsig
pcntl_wstopsig
pcntl_signal
pcntl_signal_dispatch
pcntl_get_last_error
pcntl_strerror
pcntl_sigprocmask
pcntl_sigwaitinfo
pcntl_sigtimedwait
pcntl_exec
pcntl_getpriority
pcntl_setpriority
php_uname
getmyuid
getmypid
passthru
leak
listen
diskfreespace
link
ignore_user_abord
shell_exec
dl
exec
system
highlight_file
source
show_source
fpaththru
virtual
posix_ctermid
posix_getcwd
posix_getegid
posix_geteuid
posix_getgid
posix_getgrgid
posix_getgrnam
posix_getgroups
posix_getlogin
posix_getpgid
posix_getpgrp
posix_getpid
posix
_getppid
posix_getpwnam
posix_getpwuid
posix_getrlimit
posix_getsid
posix_getuid
posix_isatty
posix_kill
posix_mkfifo
posix_setegid
posix_seteuid
posix_setgid
posix_setpgid
posix_setsid
posix_setuid
posix_times
posix_ttyname
posix_uname
proc_open
proc_close
proc_get_status
proc_nice
proc_terminate
phpinfo

If you have any questions about these functions or any security-related issues, don’t hesitate to contact Flywheel support.


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