分享php中几个字符函数小结

下面小结PHP中的几个字符函数， 小结一下：
 
1）ucfirst
   将首字母变大写，比如
  $string = "this is my web development blog";
 
echo ucfirst($string);
 
// Output: This is my web development blog
 
2) lcfirst,将首字母变小写
   $string = "This is my Web Development Blog";
 
echo lcfirst($string);
 
// Output: this is my Web Development Blog
 
3）strtoupper,将整个字符串变大写
   $string = "this is my web development blog";
 
echo strtoupper($string);
 
// Output: THIS IS MY WEB DEVELOPMENT BLOG
 
4）strtoplower，将整个字符串变小写
   $string = "tHiS is mY WeB DevElOpMenT bLoG";
 
echo strtolower($string);
 
// Output: this is my web development blog
 
5）ucwords(),可以将句子中每个单词的第一个字母变大写，比如
   $string = "this is my web development blog";
 
echo ucwords($string);
 
// Output: This Is My Web Development Blog