echo $m1 = memory_get_usage(); echo "<br />"; $var_string = "123";echo $m2 = memory_get_usage()-$m1; echo "<br />"; $n=123;echo $m3 = memory_get_usage()-$m1-$m2; echo "<br />"; $f=123.00;echo $m4 = memory_get_usage()-$m1-$m2-$m3; echo "<br />";在敲代码的时候,memory_get_usage()后面的-$m1-$m2 ...是什么意思?
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