Regarding the efficiency issue of php address reference

This article mainly introduces the php address reference (the efficiency issue of php address reference), which has a certain reference value. Now I share it with you. Friends in need can refer to

php address reference. To share efficiency issues, friends who are learning PHP can take a look at

<?php 
echo &#39;begin time:&#39;.$begin=microtime(false).&#39;<br/>&#39;;//begin to count time 
$array=array(); 
for ($i=1;$i<=10000;$i++) {//产生一个很大的数组 
$array[$i]=$i; 
} 
/* 
$arr=$array;//拷贝 拷贝并打印总时间0.02 
foreach ($arr as $ar) { 
echo $ar.&#39;<br/>&#39;; 
} 
*/ 
/* 
$newarr=&$array;//地址引用 时间总是控制在0.01之内 地址引用的优势体现出来了 
foreach ($newarr as $r) { 
echo $r.&#39;<br/>&#39;; 
} 
*/ 
foreach ($array as $a) {//基本是0.02 很少是0.01 为什么没有地址引用的快呢？纳闷 
echo $a.&#39;<br/>&#39;; 
} 
echo &#39;end time:&#39;.$end=microtime(false).&#39;<br/>&#39;;//end to count time 
echo &#39;total time:&#39;.($end-$begin); 
?>

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