請問可以這樣理解么？
<?php?
echo $m1 = memory_get_usage(); //獲取當前PHP消耗的內存值，并賦值給m1
echo "<br />";//輸出當前PHP消耗的內存值
$var_string = "12";//定義var_string變量值為“12”
echo $m2 = memory_get_usage()-$m1; //賦值給m2，獲取當前PHP消耗的內存值，并減去m1的值就是變量var_string所消耗的內存值
echo "<br />";//輸出消耗的的內存值，以下類同
$n = "123";
echo $m3 = memory_get_usage()-$m1-$m2;?
echo "<br />";
$f = "123.00";
echo $m4 = memory_get_usage()-$m1-$m2-$m3;?
echo "<br />";
$var_array = array("123");
echo $m5 = memory_get_usage()-$m1-$m2-$m3-$m4;?
?>
2016-03-07
就是這個意思
2016-04-08
<?php?
echo $m1 = memory_get_usage(); //獲取當前PHP消耗的內存值，并賦值給m1 ?并輸出m1
echo "<br />";
$var_string = "12";//定義var_string變量名并附值為“12”
2016-03-09
echo "<br />"；是回車，賦值和輸出是同一個echo進行的，比如echo $m1 = memory_get_usage();