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php强制类型转换

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Release： 2016-07-25 08:45:58
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php中的强制类型转换一般出现在算术运算符参与的环境中，算术运算符是比较常见的数字操作符，被操的内容我们一般称之为运算对象或操作数。

算术运算符通常用于整形或双精度（又称为浮点或实数）类型的数据。如果参与算术运算的对象中有字符串，php会试图将这些字符串转换成一个数字。如果其中包含“e”或“E”字符，它就会被当做是科学表示法并被转换成浮点数，否则将会被转换成整数。

php会在字符串开始处寻找数字，并且使用这些数字作为该字符串的值，如果没有找到数字，该字符串的值为0。

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