php man page for memory_get_peak_usage

MEMORY_GET_PEAK_USAGE(3)						 1						  MEMORY_GET_PEAK_USAGE(3)

memory_get_peak_usage - Returns the peak of memory allocated by PHP

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

DESCRIPTION
	Returns the peak of memory, in bytes, that's been 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 peak 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.		    |
       |	|						    |
       +--------+---------------------------------------------------+
SEE ALSO
       memory_get_usage(3), memory_limit.

PHP Documentation Group 												  MEMORY_GET_PEAK_USAGE(3)