php man page for memory_get_usage

MEMORY_GET_USAGE(3)							 1						       MEMORY_GET_USAGE(3)

memory_get_usage - Returns the amount of memory allocated to PHP

SYNOPSIS
       int memory_get_usage ([bool  $real_usage = false])

DESCRIPTION
	Returns the amount of memory, in bytes, that's currently being allocated to your PHP script.

PARAMETERS
	      o $real_usage
		-  Set this to TRUE to get the real size of memory allocated from system. If not set or FALSE only the memory used by emalloc() is
		reported.

RETURN VALUES
	Returns the memory amount in bytes.

CHANGELOG
       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.2.1	|						    |
       |	|						    |
       |	|  Compiling  with  --enable-memory-limit   is	 no |
       |	| longer required for this function to exist.	    |
       |	|						    |
       | 5.2.0	|						    |
       |	|						    |
       |	|	       $real_usage was added.		    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES
       Example #1

	      A memory_get_usage(3) example

	      <?php
	      // This is only an example, the numbers below will
	      // differ depending on your system

	      echo memory_get_usage() . "
"; // 36640

	      $a = str_repeat("Hello", 4242);

	      echo memory_get_usage() . "
"; // 57960

	      unset($a);

	      echo memory_get_usage() . "
"; // 36744

	      ?>

SEE ALSO
       memory_get_peak_usage(3), memory_limit.

PHP Documentation Group 												       MEMORY_GET_USAGE(3)