PHP内存消耗

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<?php

echo
$m1 = memory_get_usage();

echo
"<br />";

 $var_string
= "789123";

echo
$m2 = memory_get_usage()-$m1;

echo
"<br />";

 $n
= 789123;

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

echo
"<br />";

 $f
= 789123.00;

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

echo
"<br />";

 $var_array
= array("789123");

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

?>