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求解变量的实施方式

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Release： 2016-06-13 13:06:40
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求解变量的执行方式
我有一个变量是通过自定义函数复杂运算才得来的,比较耗资源..

我想知道是不是只有当这个变量要用到的时候才会去执行,还是页面一加载就把这个变量给算出来了?

如果是后面一种情况我好把这个变量放在判断语句中,也好节省些资源

另外对象的执行也跟变量一样吗?

------解决方案--------------------
程序是顺序执行的，只要运行到哪里便分配内存。

你可做成函数形的，因为函数不调用不会运行。

source：php.cn
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