在检查字符串之前，请勿使用htmlentities，您可以在之后使用它.

You should not use htmlentities before checking your strings, you may use it after.

如果将$name = htmlentities($name, ENT_QUOTES, "UTF-8");应用于some'name，它将变为some'name.

If you apply $name = htmlentities($name, ENT_QUOTES, "UTF-8"); to some'name, it will turn into some'name.

此外，要缩短图案，请使用

Also, to shorten the pattern, use

preg_match("/^[A-Z'-]{2,50}$/i", $name)

/i不区分大小写的修饰符将使整个模式不区分大小写，而[A-Z]将匹配所有大小写的ASCII字母.

The /i case insensitive modifier will make the whole pattern case insensitive, and [A-Z] will match all upper- and lowercase ASCII letters.