解决PHP数组内存耗用太多-PHP源码-php.cn

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解决PHP数组内存耗用太多

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May 25, 2016 pm 05:15 PM

php

1. [PHP]代码

$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);
}

/*
说明：

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。
本代码来自：http://www.php.cn/


*/

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