php man page for xhprof_enable

XHPROF_ENABLE(3)							 1							  XHPROF_ENABLE(3)

xhprof_enable - Start xhprof profiler

SYNOPSIS
       void xhprof_enable ([int  $flags], [array  $options])

DESCRIPTION
	Start xhprof profiling.

PARAMETERS
	      o $flags
		-  Optional  flags  to	add  additional information to the profiling. See the XHprof constants for further information about these
		flags, e.g., XHPROF_FLAGS_MEMORY to enable memory profiling.

	      o $options
		- An array of optional options, namely, the 'ignored_functions' option to pass in functions to be ignored during profiling.

RETURN VALUES
       NULL

CHANGELOG
       +--------+---------------------------------------------+
       |Version |					      |
       |	|					      |
       |	|		  Description		      |
       |	|					      |
       +--------+---------------------------------------------+
       | 0.9.2	|					      |
       |	|					      |
       |	|  The optional $options parameter was added. |
       |	|					      |
       +--------+---------------------------------------------+
EXAMPLES
       Example #1

	      xhprof_enable(3) examples

	      <?php
	      // 1. elapsed time + memory + CPU profiling; and ignore built-in (internal) functions
	      xhprof_enable(XHPROF_FLAGS_NO_BUILTINS | XHPROF_FLAGS_CPU | XHPROF_FLAGS_MEMORY);

	      // 2. elapsed time profiling; ignore call_user_func* during profiling
	      xhprof_enable(
		  0,
		  array('ignored_functions' =>	array('call_user_func',
						      'call_user_func_array')));

	      // 3. elapsed time + memory profiling; ignore call_user_func* during profiling
	      xhprof_enable(
		  XHPROF_FLAGS_MEMORY,
		  array('ignored_functions' =>	array('call_user_func',
						      'call_user_func_array')));
	      ?>

SEE ALSO 
xhprof_disable(3), xhprof_sample_enable(3), memory_get_usage(3), getrusage(3).
PHP Documentation Group 													  XHPROF_ENABLE(3)