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Notice (8): unserialize() [<a href='https://secure.php.net/function.unserialize'>function.unserialize</a>]: Error at offset 8170 of 8181 bytes [APP/Controller/NewsController.php, line 5571]

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PHP数组内存耗用太多问题的解决方法 - 站长搜索
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PHP数组内存耗用太多问题的解决方法

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2014-12-08 05:27:03 转载来源: 网络整理/侵权必删

本文为大家讲解的是PHP数组内存耗用太大问题的解决方法,感兴趣的同学参考下。 一般来说,PHP数组的内存利用率只有 1/10, 也就是说,一个在C语言里面100M 内存的数组,在PHP里面就要1G

本文为大家讲解的是PHP数组内存耗用太大问题的解决方法,感兴趣的同学参考下。

一般来说,PHP数组的内存利用率只有 1/10, 也就是说,一个在C语言里面100M 内存的数组,在PHP里面就要1G。特别是在PHP作为后台服务器的系统中,经常会出现内存耗费太大的问题。
因为这个是语言的问题,常规方案比较难以解决。下面是一种通过string 解决的方案。


$total = 100000;
$double = "";
for ($i = 0; $i < $total; $i++)
{
$double .= pack("d", $i + 0.1);
}
for ($i = 0; $i < $total; $i++)
{
unpack("@" . ($i * 8) . "/d", $double);
}


这个例子用一个string 保存一个double 的数组。然后在使用的时候unpack出来。
当然,这会影响性能。要看具体的需求。

比如这样的情况下:
你有10个数组,每个数组10M (1百万数据左右),那么十个要花费 100M内存。
再加上10个人并发的话,内存就会严重不够了。
然后,在10个数组,不是每次都同时使用的。你可以,把他们保存成string
然后,在使用的时候,unpack某一个string变成一个数组。


标签: PHP 数组 内存 耗用 太多 题的 解决 方法


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