log_message($level, $message)

array_replace(array $array1[, ...])

is_really_writable($file)

set_status_header($code[, $text = ''])

mb_strlen($str[, $encoding = NULL])

hash_pbkdf2($algo, $password, $salt, $iterations[, $length = 0[, $raw_output = FALSE]])

is_cli()

is_php($version)