Current Path : C:/xampp/htdocs/moodle/lib/horde/framework/Horde/Support/ |
Current File : C:/xampp/htdocs/moodle/lib/horde/framework/Horde/Support/Memory.php |
<?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] ); } }