Paste_Image.png
Paste_Image.png
$str = "Hello kiNg";
var_dump(is_string($str));//boolean true
echo "字符串長(zhǎng)度為: " . strlen($str);//字符串長(zhǎng)度為: 10
echo "<br/>";
echo strtolower($str);//hello king
echo "<br/>";
echo strtoupper($str);//HELLO KING
echo "<br/>";
echo ucfirst($str);//Hello kiNg 將字符串的首字母轉(zhuǎn)換為大寫
echo "<br/>";
echo ucwords($str);//Hello KiNg 將字符串中每個(gè)單詞的首字母轉(zhuǎn)換為大寫
