php查看一个变量的占用内存的实例代码_php技巧_

'; $start = memory_get_usage(); $a = Array(); for ($i=0; $i<1000; $i++) { $a[$i] = $i + $i; } $mid = memory_get_usage(); echo memory_get_usage() , '
'; for ($i=1000; $i<2000; $i++) { $a[$i] = $i + $i; } $end = memory_get_usage(); echo memory_get_usage() , '
'; echo 'argv:', ($mid - $start)/1000 ,'bytes' , '
'; echo 'argv:',($end - $mid)/1000 ,'bytes' , '
'; echo 'Memory:', ($mid - $start)/1024 ,'k' , '
'; echo 'Memory:',($end - $mid)/1024 ,'k' , '
'; 输出是: 389336 418056 442632 argv:28.72bytes argv:24.576bytes Memory:28.046875k Memory:24k

'; echo 'Memory:', ($mid - $start)/1024 ,'k' , '
'; $b = array_fill(0, 10000, 1); $end = memory_get_usage(); //10k elements array; echo 'argv:', ($end - $mid)/10000 ,'byte' , '
'; echo 'Memory:',($end - $mid)/1024 ,'k' , '
'; 得到: argv:54.5792byte argv:54.5784byte argv:39.736byte Memory:388.046875k argv:39.736byte Memory:388.046875k

 $start_memory = memory_get_usage(); $foo = "Some variable"; echo memory_get_usage() - $start_memory;