PHP self-study no00011 data type conversion

<!--(boolean)转成布尔型-->
<!--(string)转成字符串型-->
<!--(integer)转成整型-->
<!--(float)转成浮点型-->
<!--(array)转成数组-->
<!--(object)转成对象-->
<!--settype(变量,&#39;类型&#39;)   转后原变量改变-->
<?php $num = &#39;3.141592653r*r&#39;;
	echo &#39;使用(integer)转成整型：&#39;;
	echo (integer)$num;
	echo &#39;<p>';
	echo '不转换输出原来的变量';
	echo $num;
	echo '<p>';
	echo '使用函数settype()转换变量类型';
	settype($num,'integer');			//这里integer要单引号不然报错
	echo $num;
	echo '</p><p>';
	echo '输出函数转换后的变量';
	echo $num
    /*
	注意用函数settype()后变量本身已转换，而(float)等变量本身没变只输出变了
	*/
?></p>

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