有返回值的函数
function makeBold($inputText)//定义function makeBold()函数
{
$boldedText = "";
$boldedText .= $inputText;
$boldedText .= "";
return($boldedText);//返回变量$boldedText
}
print("这行没有加重！！！
\n");//直接打印字符串
print(makeBold("这行被加重了！！！") . "
\n");//调用function makeBold()函数
print("这行没有加重！！！
\n");//直接打印字符串
?>
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