startTime = microtime(true); } function timerEnd(){ echo number_format( (microtime(true) - $this->startTime)*1000, 2 ), ' ms'; } } class ProfilerHolder { protected $profiler; public function __construct( Profiler $profiler ){ $this->profiler = $profiler; } } ini_set('memory_limit', '1M'); $profiler = new Profiler(); $profiler->timerStart(); get_usage_in_kb(); $holder = new ProfilerHolder( $profiler ); $b = null; /** * @return string */ function make_dummy_data() { return str_repeat( "Hello|", 114242 ); } $a = make_dummy_data(); $data = explode( '|', $a ); // comment this after narrowing down that a lot of memory is being used here //$data = array(); // uncomment this and memory usage will drop $buffer = array(); foreach( $data as $key => $item ){ $buffer[] = $item; } get_usage_in_kb(); unset($a); get_usage_in_kb(); echo memory_get_peak_usage(TRUE)/1024, ' kb', "\n"; $profiler->timerEnd(); unset( $profiler ); xdebug_debug_zval( 'profiler' ); //var_dump( $holder );