个回答

• qq_馨儿_2

  2017-06-17 10:05:14

  已采纳

  用strtoupper函数

  <?php

  $string = "hoPe YOU a day";

  $lower = strtolower(substr ($string,1,13));

  $upper = strtoupper(substr ($string,0,1));

  echo $upper.$lower;

  ?>

  
  

  0