foreach for Iterator效能對比

**如下

/**

* iterator,for,foreach比較
* date 2018-12-14
*/public class test 
//執行完後的時間
long end =system.nanotime();
return (end- start) / (1000);
} //foeach迴圈遍歷
public static long testforeach()
//執行完後的時間
long end =system.nanotime();
return (end- start) / (1000);
} //for迴圈遍歷
public static long testfor()
$end_for_time = microtime_float();
$for_time = $end_for_time - $start_for_time;
echo 'for迴圈遍歷耗時：'.$for_time.'
'; 
//for迴圈遍歷（count在外部）耗時：0.023999929428101

2.1萬級資料下測試結果為for效能最好，且count在外部

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