這些代碼寫出來為什么只有5個(gè)值，被打印到屏幕上呢,我覺得應(yīng)該有6個(gè)啊

<?php?

echo $m1 = memory_get_usage(); ?

?218912

320
272
272
576220488280648310672

echo " ";

?$var_string = "123";

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

echo " ";

$n=123;?

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

echo " ";

$f=123.00;

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

echo " ";

?$var_array = array("123");

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

? echo $m1 = memory_get_usage();//先寫這一句。

$var = ?str_repeat("liuhui", 10000);

//然后再運(yùn)行這一句（把liuhuI重復(fù)10000遍）看看占用多少內(nèi)存

echo $m1 = memory_get_usage();

$var_string= str_repeat("123", 10001);

echo $m1 = memory_get_usage();

?>

<?php?

echo $m1 = memory_get_usage();?

echo " ";

?$var_string = "123";

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

echo " ";

$n=123;?

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

echo " ";

$f=123.00;

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

echo " ";

?$var_array = array("123");

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

? echo $m1 = memory_get_usage();//先寫這一句。

$var = ?str_repeat("liuhui", 10000);

//然后再運(yùn)行這一句（把liuhuI重復(fù)10000遍）看看占用多少內(nèi)存

echo $m1 = memory_get_usage();

$var_string= str_repeat("123", 10001);

echo $m1 = memory_get_usage();

?>

<?php?

echo $m1 = memory_get_usage();?

echo " ";

?$var_string = "123";

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

echo " ";

$n=123;?

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

echo " ";

$f=123.00;

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

echo " ";

?$var_array = array("123");

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

? echo $m1 = memory_get_usage();//先寫這一句。

$var = ?str_repeat("liuhui", 10000);

//然后再運(yùn)行這一句（把liuhuI重復(fù)10000遍）看看占用多少內(nèi)存

echo $m1 = memory_get_usage();

$var_string= str_repeat("123", 10001);

echo $m1 = memory_get_usage();

?><?php?

echo $m1 = memory_get_usage();?

echo " ";

?$var_string = "123";

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

echo " ";

$n=123;?

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

echo " ";

$f=123.00;

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

echo " ";

?$var_array = array("123");

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

? echo $m1 = memory_get_usage();//先寫這一句。

$var = ?str_repeat("liuhui", 10000);

//然后再運(yùn)行這一句（把liuhuI重復(fù)10000遍）看看占用多少內(nèi)存

echo $m1 = memory_get_usage();

$var_string= str_repeat("123", 10001);

echo $m1 = memory_get_usage();

?><?php?

echo $m1 = memory_get_usage();?

echo " ";

?$var_string = "123";

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

echo " ";

$n=123;?

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

echo " ";

$f=123.00;

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

echo " ";

?$var_array = array("123");

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

? echo $m1 = memory_get_usage();//先寫這一句。

$var = ?str_repeat("liuhui", 10000);

//然后再運(yùn)行這一句（把liuhuI重復(fù)10000遍）看看占用多少內(nèi)存

echo $m1 = memory_get_usage();

$var_string= str_repeat("123", 10001);

echo $m1 = memory_get_usage();

?><?php?

echo $m1 = memory_get_usage();?

echo " ";

?$var_string = "123";

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

echo " ";

$n=123;?

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

echo " ";

$f=123.00;

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

echo " ";

?$var_array = array("123");

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

? echo $m1 = memory_get_usage();//先寫這一句。

$var = ?str_repeat("liuhui", 10000);

//然后再運(yùn)行這一句（把liuhuI重復(fù)10000遍）看看占用多少內(nèi)存

echo $m1 = memory_get_usage();

$var_string= str_repeat("123", 10001);

echo $m1 = memory_get_usage();

?><?php?

echo $m1 = memory_get_usage();?

echo " ";

?$var_string = "123";

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

echo " ";

$n=123;?

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

echo " ";

$f=123.00;

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

echo " ";

?$var_array = array("123");

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

? echo $m1 = memory_get_usage();//先寫這一句。

$var = ?str_repeat("liuhui", 10000);

//然后再運(yùn)行這一句（把liuhuI重復(fù)10000遍）看看占用多少內(nèi)存

echo $m1 = memory_get_usage();

$var_string= str_repeat("123", 10001);

echo $m1 = memory_get_usage();

?><?php?

echo $m1 = memory_get_usage();?

echo " ";

?$var_string = "123";

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

echo " ";

$n=123;?

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

echo " ";

$f=123.00;

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

echo " ";

?$var_array = array("123");

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

? echo $m1 = memory_get_usage();//先寫這一句。

$var = ?str_repeat("liuhui", 10000);

//然后再運(yùn)行這一句（把liuhuI重復(fù)10000遍）看看占用多少內(nèi)存

echo $m1 = memory_get_usage();

$var_string= str_repeat("123", 10001);

echo $m1 = memory_get_usage();

?>

<?php?

echo $m1 = memory_get_usage();?

echo " ";

?$var_string = "123";

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

echo " ";

$n=123;?

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

echo " ";

$f=123.00;

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

echo " ";

?$var_array = array("123");

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

? echo $m1 = memory_get_usage();//先寫這一句。

$var = ?str_repeat("liuhui", 10000);

//然后再運(yùn)行這一句（把liuhuI重復(fù)10000遍）看看占用多少內(nèi)存

echo $m1 = memory_get_usage();

$var_string= str_repeat("123", 10001);

echo $m1 = memory_get_usage();

?><?php?

echo $m1 = memory_get_usage();?

echo " ";

?$var_string = "123";

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

echo " ";

$n=123;?

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

echo " ";

$f=123.00;

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

echo " ";

?$var_array = array("123");

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

? echo $m1 = memory_get_usage();//先寫這一句。

$var = ?str_repeat("liuhui", 10000);

//然后再運(yùn)行這一句（把liuhuI重復(fù)10000遍）看看占用多少內(nèi)存

echo $m1 = memory_get_usage();

$var_string= str_repeat("123", 10001);

echo $m1 = memory_get_usage();

?><?php?

echo $m1 = memory_get_usage();?

echo " ";

?$var_string = "123";

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

echo " ";

$n=123;?

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

echo " ";

$f=123.00;

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

echo " ";

?$var_array = array("123");

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

? echo $m1 = memory_get_usage();//先寫這一句。

$var = ?str_repeat("liuhui", 10000);

//然后再運(yùn)行這一句（把liuhuI重復(fù)10000遍）看看占用多少內(nèi)存

echo $m1 = memory_get_usage();

$var_string= str_repeat("123", 10001);

echo $m1 = memory_get_usage();

?><?php?

echo $m1 = memory_get_usage();?

echo " ";

?$var_string = "123";

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

echo " ";

$n=123;?

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

echo " ";

$f=123.00;

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

echo " ";

?$var_array = array("123");

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

? echo $m1 = memory_get_usage();//先寫這一句。

$var = ?str_repeat("liuhui", 10000);

//然后再運(yùn)行這一句（把liuhuI重復(fù)10000遍）看看占用多少內(nèi)存

echo $m1 = memory_get_usage();

$var_string= str_repeat("123", 10001);

echo $m1 = memory_get_usage();

?><?php?

echo $m1 = memory_get_usage();?

echo " ";

?$var_string = "123";

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

echo " ";

$n=123;?

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

echo " ";

$f=123.00;

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

echo " ";

?$var_array = array("123");

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

? echo $m1 = memory_get_usage();//先寫這一句。

$var = ?str_repeat("liuhui", 10000);

//然后再運(yùn)行這一句（把liuhuI重復(fù)10000遍）看看占用多少內(nèi)存

echo $m1 = memory_get_usage();

$var_string= str_repeat("123", 10001);

echo $m1 = memory_get_usage();

?><?php?

echo $m1 = memory_get_usage();?

echo " ";

?$var_string = "123";

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

echo " ";

$n=123;?

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

echo " ";

$f=123.00;

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

echo " ";

?$var_array = array("123");

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

? echo $m1 = memory_get_usage();//先寫這一句。

$var = ?str_repeat("liuhui", 10000);

//然后再運(yùn)行這一句（把liuhuI重復(fù)10000遍）看看占用多少內(nèi)存

echo $m1 = memory_get_usage();

$var_string= str_repeat("123", 10001);

echo $m1 = memory_get_usage();

?>

?218912

320
272
272
576220488280648310672

?

慕尼黑1004667

2017-03-25

源自：PHP入門篇 3-4

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1 回答

hywoo
2017-03-25

可能是不夠嚴(yán)謹(jǐn)或者太繁瑣不夠簡(jiǎn)單

0 回復(fù) 有任何疑惑可以回復(fù)我~

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這些代碼寫出來為什么只有5個(gè)值，被打印到屏幕上呢,我覺得應(yīng)該有6個(gè)啊

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這些代碼寫出來為什么只有5個(gè)值，被打印到屏幕上呢,我覺得應(yīng)該有6個(gè)啊

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這些代碼寫出來為什么只有5個(gè)值，被打印到屏幕上呢,我覺得應(yīng)該有6個(gè)啊

這些代碼寫出來為什么只有5個(gè)值，被打印到屏幕上呢,我覺得應(yīng)該有6個(gè)啊

這些代碼寫出來為什么只有5個(gè)值，被打印到屏幕上呢,我覺得應(yīng)該有6個(gè)啊