[PHP字符串]⑤--字符串函数

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$str = "Hello kiNg";
var_dump(is_string($str));//boolean true
echo "字符串长度为: " . strlen($str);//字符串长度为: 10

echo "<br/>";
echo strtolower($str);//hello king

echo "<br/>";
echo strtoupper($str);//HELLO KING

echo "<br/>";
echo ucfirst($str);//Hello kiNg 将字符串的首字母转换为大写

echo "<br/>";
echo ucwords($str);//Hello KiNg 将字符串中每个单词的首字母转换为大写