到底是怎么获取数据类型的?
<?php
echo $m1 = memory_get_usage();
echo "<br />";
$var_string = "123";
echo $m2 = memory_get_usage()-$m1;
echo "<br />";
echo $m3 = memory_get_usage()-$m1-$m2;
echo "<br />";
echo $m4 = memory_get_usage()-$m1-$m2-$m3;
echo "<br />";
echo $m5 = memory_get_usage()-$m1-$m2-$m3-$m4;
?>
结果:217288 320 136 136 136 怎么搞的,获取的不都是字符串类型吗?怎么会不一样了?