奇怪的PHP引用效率问题分析

复制代码 代码如下:

function update_timelist(&$arr,$timestamp,$threshold){
$timequeue = &$arr['timequeue'];
while(!empty($timequeue[0])&&($timestamp-$timequeue[0])>$threshold){
array_shift($timequeue);
}
array_push($timequeue, $timestamp);
if($arr['count']<count($timequeue)){
$arr['count'] = count($timequeue);
}
}

复制代码 代码如下:

function update_timelist(&$arr,$timestamp,$threshold){
while(!empty($arr['timequeue'][0])&&($timestamp-$arr['timequeue'][0])>$threshold){
array_shift($arr['timequeue']);
}
array_push($arr['timequeue'], $timestamp);
if($arr['count']<count($arr['timequeue'])){
$arr['count'] = count($arr['timequeue']);
}

复制代码 代码如下:

$a = 'vevb.com';
$b = $a;
$c = $b;

复制代码 代码如下:

$a = 'vevb.com';
$b = $a;
$c = &$a;