<?php 

echo $m1 = memory_get_usage(); 

echo "<br />";

$r="123";

echo $m2 = memory_get_usage()-$m1; 

echo "<br />";

 $n=123;

echo $m3 = memory_get_usage()-$m1-$m2; 

echo "<br />";

$bb_g=456.00;

echo $m4 = memory_get_usage()-$m1-$m2-$m3; 

echo "<br />";

 $var_array=array("111");

echo $m5 = memory_get_usage()-$m1-$m2-$m3-$m4; 

?>

显示结果为

619120

352
288
288
632

当我把$r改成$var_string值不变 内存的消耗变成了328  这是不是说明内存的消耗和变量的字数有关系