<?php echo '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>
The above introduces the PHP self-study no00009 data type floating point pi output, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.
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