30秒学会 PHP 片段 – isUpperCase

Returns true if the given string is upper case, false otherwise.

Convert the given string to upper case, using strtoupper and compare it to the original.

代码实现

function isUpperCase($string)
{
  return $string === strtoupper($string);
}

使用样例

isUpperCase('MORNING SHOWS THE DAY!'); // true
isUpperCase('qUick Fox'); // false