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为什么一个变量赋值为1消耗的内存和另外一个变量也赋值为1消耗的内存空间不一样呢?
分別賦值 primitive value 不涉及到寫時複製吧。。。
$foo = 1; $bar = $foo;
這樣纔會涉及到寫時複製
分別賦值 primitive value 不涉及到寫時複製吧。。。
這樣纔會涉及到寫時複製