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<?php
/**
* Simple interface for tracking memory consumption.
*
* <code>
* $t = new Horde_Support_Memory;
* $t->push();
* $used = $t->pop();
* </code>
*
* Do not expect too much of this memory tracker. Profiling memory is not
* trivial as your placement of the measurements may obscure important
* information. As a trivial example: Assuming that your script used 20 MB of
* memory befory you call push() the information you get when calling pop()
* might only tell you that there was less than 20 MB of memory consumed in
* between the two calls. Take the changes to internal memory handling of PHP in
* between the different versions into account
* (http://de3.php.net/manual/en/features.gc.performance-considerations.php) and
* you should get an idea about why you might be cautious about the values you
* get from this memory tracker.
*
* Copyright 2011-2017 Horde LLC (http://www.horde.org/)
*
* @category Horde
* @package Support
* @license http://www.horde.org/licenses/bsd
*/
class Horde_Support_Memory
{
/**
* Holds the starting memory consumption.
*
* @var array
*/
protected $_start = array();
/**
* Current index for stacked trackers.
*
* @var integer
*/
protected $_idx = 0;
/**
* Push a new tracker on the stack.
*/
public function push()
{
$start = $this->_start[$this->_idx++] = array(
memory_get_usage(),
memory_get_peak_usage(),
memory_get_usage(true),
memory_get_peak_usage(true)
);
return $start;
}
/**
* Pop the latest tracker and return the difference with the current
* memory situation.
*
* @return array The change in memory allocated via emalloc() in between the
* push() and the pop() call. The array holds four values: the
* first one indicates the change in current usage of memory
* while the second value indicates any changes in the peak
* amount of memory used. The third and fourth value show
* current and peak usage as well but indicate the real memory
* usage and not just the part allocated via emalloc(),
*/
public function pop()
{
if (! ($this->_idx > 0)) {
throw new Exception('No timers have been started');
}
$start = $this->_start[--$this->_idx];
return array(
memory_get_usage() - $start[0],
memory_get_peak_usage() - $start[1],
memory_get_usage(true) - $start[2],
memory_get_peak_usage(true) - $start[3]
);
}
}