php获取内存使用量

[php]代码库

echo "Initial: ".memory_get_usage()." bytes \n";  
/* prints  
Initial: 361400 bytes  
*/ 
 
// let's use up some memory  
for ($i = 0; $i < 100000; $i++) {  
    $array []= md5($i);  
}  
 
// let's remove half of the array  
for ($i = 0; $i < 100000; $i++) {  
    unset($array[$i]);  
}  
 
echo "Final: ".memory_get_usage()." bytes \n";  
/* prints  
Final: 885912 bytes  
*/ 
 
echo "Peak: ".memory_get_peak_usage()." bytes \n";  
/* prints  
Peak: 13687072 bytes  
*/