php的内存分配还是很智能的

<?php

echo memory_get_usage().PHP_EOL;
$a = 1;
$b = $a;
echo memory_get_usage().PHP_EOL;

<?php

echo memory_get_usage().PHP_EOL;
$a = 1;
$b = 1;
echo memory_get_usage().PHP_EOL;

第一个比第二个省内存

PS D:\WWW\php-> php .\memery_get_usage.php                                                                   

225664                                                                                                       

225936                                                                                                       

PS D:\WWW\php->                                                                                              

PS D:\WWW\php-> php .\memery_get_usage.php                                                                   

225696                                                                                                       

226032          

 

c结构体 zval - -！