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
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