PHP self-study no00009 data type floating point pi output

<?php echo &#39;圆周率的3种书写方法：<p>';
	echo '第一种：pi()='.pi().'<p>';
	echo '第二种：3.14159265359 = 3.14159265359</p><p>';
	echo '第三种：314159265359E-11 = 314159265359E-11</p><p>';
	/*php字符串的连接符是.不是+哈哈记住了*/

?>
</p>

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