Size of an array in memory in php

Question

I am trying to figure out the size of a variable in php.

The reason i need to do this is because if it is over 1mb i need to use a different form of caching rather than memcache as memcache has a limit of 1mb.

I am using the below:

 $start_memory = memory_get_usage();
 $this->results= $dataReader->readAll();
 $this->end_memory = memory_get_usage() - $start_memory;

The results are coming back as 50mb which is very inaccurate. I have looked at str length also but the data is an array. Can someone let me know the most accurate way of detecting the size of a variable in php.

Languages that allow you to do this are the exception, and PHP is not one of them. You 'll have to attack the problem differently. — Jon
– Jon, Commented Jun 1, 2013 at 20:01

Baba · Accepted Answer · 2013-06-01 19:59:16Z

2

You can Use MultipartCache it's a simple class that extends memcache to help you split the arrays or string automatically

Simple Test

$cache = new Mcache\Main();
$cache->addserver("127.0.0.1");  // Local memecache server

$cache->set($key, file_get_contents("large_image.jpg"));

header("Content-Type: image/jpeg");
echo $cache->get($key); // large image for cache

If you are just interested in the size of of your data then

$data = serialize($this->results);
echo strlen($data) . " bytes";

edited Jun 1, 2013 at 19:59

answered Jun 1, 2013 at 18:22

Baba

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1 Comment

Matthew Chambers Over a year ago

this is what i am using- there is no point in using memcache though i guess for encoding decoding if the contents are less than 1mb- extra overhead. multipartcache great class though and very useful

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