为什么不加首句，是已经自己编译了吗？而且加了首句后是显示输入错误
<?php
$m1 = "1123456";
echo $m1 = memory_get_usage();
echo "<br />";
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;
?>
