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