有默认参数的函数
function printColored($Text, $Color="black")//定义function函数
{
print("$Text");//获取字符串的内容和颜色
}
printColored("这是黑颜色的字！");//调用function函数
print("
");
printColored("这是蓝颜色的字！", "blue");//调用function函数
print("
");
?>
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