Check memory consumption, when one large blob is refered via object

mem_by_ref.php

<?php

$start_memory = memory_get_usage( true );

$generic_info = new stdClass();
$generic_info->name = 'generic_info';
$generic_info->hash = str_repeat( 'XOR', 333 );

$objects_list = array();
for ( $index = 0; $index < 10000; $index++ ) {
    $tmp_object = new stdClass();
    $tmp_object->foo = 'bar';
    $tmp_object->bar = 'baz';
    $tmp_object->generic = $generic_info; // try `clone $generic_info` for a difference
    $objects_list[] = $tmp_object;
    unset( $tmp_object );
}

printf( "Used %8.5f Mb\n", ( memory_get_usage( true ) - $start_memory ) / ( 1024 * 1024 ) );