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php对象在内存中的存在形式分析_php技巧

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Release: 2016-05-16 20:24:04
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本文实例分析了php对象在内存中的存在形式。分享给大家供大家参考。具体分析如下:

<&#63;php
class Person{
 public $name;
 public $age;
}
$p1 = new Person();
$p1->name = "小明";
$p1->age=80;
$p2=$p1;
$p2->age=85;
echo $p2->name;
echo $p1->age;
&#63;>
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(1)$p1对应内存地址,假设是0x123,($p1和地址存放在栈区,相当于我们查字典时的索引);
(2)通过内存地址的索引,找到堆区。堆区里面存放着”小王“,”80“等数据
(3)$p2 = $p1,实际上是将$p1的内存地址0x123传给$p2,堆区里的属性$name,$age不变,也就是不会再重新复制一份。所以,在改变$p2->age=85时,$p1->age的值也改变了。

希望本文所述对大家的php程序设计有所帮助。

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