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$memo = xdebug_memory_usage();
$memo = xdebug_memory_usage();//赋值两次是为了消除 $memo 自身的影响
$a = array();
echo xdebug_memory_usage() - $memo, PHP_EOL;
$a[] = 1;
echo xdebug_memory_usage() - $memo, PHP_EOL;
$a[] = 1;
echo xdebug_memory_usage() - $memo, PHP_EOL;
168 //空数组$memo = memory_get_usage();
$memo = memory_get_usage();
$a = array();
echo memory_get_usage() - $memo, PHP_EOL;
$a[] = 1;
echo memory_get_usage() - $memo, PHP_EOL;
$a[] = 1;
echo memory_get_usage() - $memo, PHP_EOL;
$a=memory_get_usage(), '<br />';
unset($arr);
echo $a-memory_get_usage();