PHP8 issue: disk_free_space() generates fatal error at some webhosts - please add function_exists()

[canufarm]

Hi,

if a webhost excludes the function disk_free_space() in his PHP-settings because of security, backupwordpress crashes, because since PHP8 "@" does not longer suppress fatal errors.

So if the webhost has set
disable_functions="diskfreespace, disk_free_space"
backupwordpress will no longer work. Please always check, if the function disk_free_space() exists before use, because a lot of webhosts do not allow this function.

Thanks.

[nicomollet]

Same problem here on Kinsta hosting, with PHP 8.0.

[uaibo]

I can confirm, the site breaks from this fatal error after switching to PHP8.0 (on Kinsta)

Fatal error: Uncaught Error: Call to undefined function HM\BackUpWordPress\disk_free_space()

in /wp-content/plugins/backupwordpress/functions/interface.php on line 498

I have temporarily fixed it by checking the function exists but you need to find a permanent fix on the next update so that it doesn't break sites.

if( !function_exists('@disk_free_space') ){
    return false;
}

BackupWordpress version: 3.13
PHP version: 8.0.24
Platform: Kinsta

(update): Confirmed, these functions are disabled on Kinsta:

exec, passthru, shell_exec, system, proc_open, popen, show_source, apache_child_terminate, apache_get_modules, apache_get_version, apache_getenv, apache_note, apache_setenv, posix_kill, posix_mkfifo, posix_setpgid, posix_setsid, posix_setuid, posix_getpwuid, posix_uname, pclose, dl, disk_free_space, diskfreespace, disk_total_space, pcntl_exec, proc_close, proc_get_status, proc_nice, proc_terminate, symlink, link, 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, highlight_file, lchgrp, lchown, prog_get_status, getmypid, getmyuid, getmygid, getrusage, getmyinode, get_current_user, libxml_disable_entity_loader