Some functions are system-dependent in that if they're not detected at compile time, they won't be included in PHP. Currently the documentation does not tell the user any information about this type of function availability and could cause some confusion when a user tries to use a function and it says "Call to undefined function".
Opinions of the proposed entity?:
<!ENTITY note.func.sysdep '<note><para>This function is system-dependent and may not be available in your copy of PHP. Use <function>function_exists</function> to be certain.</para></note>'>
Looking at php-src/ext/standard/basic_functions.c for example, these functions may or may not be available in your copy of PHP, depending on various factors:
time_nanosleep() strftime() gmstrftime() strcoll() money_format() nl_langinfo() readlink() linkinfo() symlink() link() proc_open() proc_close() proc_terminate() proc_get_status() proc_nice() getservbyname() getservbyport() getprotobyname() getprotobynumber() asinh() aconh() atanh() hypot() inet_ntop() inet_pton() putenv() getopt() microtime() gettimeofday() stream_set_timeout() realpath() fnmatch() crypt() chroot() glob() touch() openlog() syslog() closelog() define_syslog_variables() ftok()
Dave
