Const rKeyword
rKeyword: RegExp = /\b((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))\b/i
PHP 关键字
See https://www.php.net/manual/en/reserved.keywords.php