Re: Proposal: new extension of selinux

KaiGai Kohei wrote: > I have a question about interface of PHP function. > > Is it a right manner to consider 'false' as an error condition > on a function which returns string? > > For example, I defined the following wrapper functions: > string selinux_getfscreatecon(void) > > It returns a security context for a new filesystem object in text > representation, if it is explicitly configured. A process does not > have this context in the default, so this function returns an empty > string in most cases. > However, we have to consider a possibility system returns an error > status. This functions returns 'false' on errors. > > My point is whether we can discriminate between an empty string > and a false value, or not. If inappropriate, it is necessary to > design API specifications for them again. :( > > | $ php -r 'if ("" == false) { echo "T\n"; } else { echo > "F\n"; }' > | T > | $ php -r 'if (is_string("")) { echo "T\n"; } else { echo > "F\n"; }' > | T > | $ php -r 'if (is_string(false)) { echo "T\n"; } else { echo "F\n"; > }' > | F > > Hmm... A few folks suggested me in private message, to use "===" operator. It can resolve this matter. Thanks, -- OSS Platform Development Division, NEC KaiGai Kohei <kaigai@ak.jp.nec.com>