( (a(bstract|nd|rray|s))| (c(a(llable|se|tch)|l(ass|one)|on(st|tinue)))| (d(e(clare|fault)|ie|o))| (e(cho|lse(if)?|mpty|nd(declare|for(each)?|if|switch|while)|val|x(it|tends)))| (f(inal|or(each)?|unction))| (g(lobal|oto))| (i(f|mplements|n(clude(_once)?|st(anceof|eadof)|terface)|sset))| (n(amespace|ew))| (p(r(i(nt|vate)|otected)|ublic))| (re(quire(_once)?|turn))| (s(tatic|witch))| (t(hrow|r(ait|y)))| (u(nset|se))| (__halt_compiler|break|list|(x)?or|var|while) )
正则,判断php关键字。