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 <html>
  <head>
   <title> strtoupper2.php </title>
   <meta charset="UTF-8">
   <meta name="Author" content="">
   <meta name="Keywords" content="">
   <meta name="Description" content="">
  </head> <body>
 <?php
 $str = "i want to Fly";
 $str2 = strtoupper($str);
 echo $str;
 echo '<br>';
 echo $str2;
 ?>
  </body>
 </html>i want to Fly
 I WANT TO FLY （2）strtoupper()函数。该函数作用同strtolower 函数刚好相反，是将传入的字符串参数的
 字符全部转换成大写，并以大写的形式返回这个字符串。该函数声明如下：
 string strtoupper ( string string)