php方法传值和传引用性能比较
Posted 犀利瓜
tags:
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测试代码test.php：
<?php
function microtime_float()
{
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
function a($arr) {
$data = [];
foreach($arr as $var) {
$data[] = $var;
}
return $data;
}
function b(&$arr) {
$data = [];
foreach($arr as $var) {
$data[] = $var;
}
return $data;
}
$arr = [
[
‘aaa‘ => [
‘aaa‘=>‘bbb‘,
‘bbb‘=>‘bbb‘,
‘ccc‘=>‘bbb‘,
‘ddd‘=>‘bbb‘,
‘eee‘=>‘bbb‘,
‘fff‘=>‘bbb‘,
‘add‘=>‘bbb‘,
‘dse‘=>‘bbb‘,
‘dad‘=>‘bbb‘,
‘dsa‘=>‘bbb‘,
‘das‘=>‘bbb‘,
‘ewq‘=>‘bbb‘,
‘qer‘=>‘bbb‘,
‘qad‘=>‘bbb‘,
‘asz‘=>‘bbb‘,
‘gda‘=>‘bbb‘,
‘abc‘=>‘bbb‘,
‘vbv‘=>‘bbb‘,
‘ewq‘=>‘bbb‘,
‘tew‘=>‘bbb‘,
],
‘bbb‘ => [
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>[
‘aaa‘=>‘bbb‘,
‘bbb‘=>‘bbb‘,
‘ccc‘=>‘bbb‘,
‘ddd‘=>‘bbb‘,
‘eee‘=>‘bbb‘,
‘fff‘=>‘bbb‘,
‘add‘=>‘bbb‘,
‘dse‘=>‘bbb‘,
‘dad‘=>‘bbb‘,
‘dsa‘=>‘bbb‘,
‘das‘=>‘bbb‘,
‘ewq‘=>‘bbb‘,
‘qer‘=>‘bbb‘,
‘qad‘=>‘bbb‘,
‘asz‘=>‘bbb‘,
‘gda‘=>‘bbb‘,
‘abc‘=>‘bbb‘,
‘vbv‘=>‘bbb‘,
‘ewq‘=>‘bbb‘,
‘tew‘=>[
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>[
‘aaa‘=>‘bbb‘,
‘bbb‘=>‘bbb‘,
‘ccc‘=>‘bbb‘,
‘ddd‘=>‘bbb‘,
‘eee‘=>‘bbb‘,
‘fff‘=>‘bbb‘,
‘add‘=>‘bbb‘,
‘dse‘=>‘bbb‘,
‘dad‘=>‘bbb‘,
‘dsa‘=>‘bbb‘,
‘das‘=>‘bbb‘,
‘ewq‘=>‘bbb‘,
‘qer‘=>‘bbb‘,
‘qad‘=>‘bbb‘,
‘asz‘=>‘bbb‘,
‘gda‘=>‘bbb‘,
‘abc‘=>‘bbb‘,
‘vbv‘=>‘bbb‘,
‘ewq‘=>‘bbb‘,
‘tew‘=>[
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>[
‘aaa‘=>‘bbb‘,
‘bbb‘=>‘bbb‘,
‘ccc‘=>‘bbb‘,
‘ddd‘=>‘bbb‘,
‘eee‘=>‘bbb‘,
‘fff‘=>‘bbb‘,
‘add‘=>‘bbb‘,
‘dse‘=>‘bbb‘,
‘dad‘=>‘bbb‘,
‘dsa‘=>‘bbb‘,
‘das‘=>‘bbb‘,
‘ewq‘=>‘bbb‘,
‘qer‘=>‘bbb‘,
‘qad‘=>‘bbb‘,
‘asz‘=>‘bbb‘,
‘gda‘=>‘bbb‘,
‘abc‘=>‘bbb‘,
‘vbv‘=>‘bbb‘,
‘ewq‘=>‘bbb‘,
‘tew‘=>‘bbb‘,
],
],
],
],
],
],
‘ccc‘ => [
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>‘bbb‘,
‘caa‘=>[
‘aaa‘=>‘bbb‘,
‘bbb‘=>‘bbb‘,
‘ccc‘=>‘bbb‘,
‘ddd‘=>‘bbb‘,
‘eee‘=>‘bbb‘,
‘fff‘=>‘bbb‘,
‘add‘=>‘bbb‘,
‘dse‘=>‘bbb‘,
‘dad‘=>‘bbb‘,
‘dsa‘=>‘bbb‘,
‘das‘=>‘bbb‘,
‘ewq‘=>‘bbb‘,
‘qer‘=>‘bbb‘,
‘qad‘=>‘bbb‘,
‘asz‘=>‘bbb‘,
‘gda‘=>‘bbb‘,
‘abc‘=>‘bbb‘,
‘vbv‘=>‘bbb‘,
‘ewq‘=>‘bbb‘,
‘tew‘=>[
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>‘bbb‘,
‘qaa‘=>[
‘aaa‘=>‘bbb‘,
‘bbb‘=>‘bbb‘,
‘ccc‘=>‘bbb‘,
‘ddd‘=>‘bbb‘,
‘eee‘=>‘bbb‘,
‘fff‘=>‘bbb‘,
‘add‘=>‘bbb‘,
‘dse‘=>‘bbb‘,
‘dad‘=>‘bbb‘,
‘dsa‘=>‘bbb‘,
‘das‘=>‘bbb‘,
‘ewq‘=>‘bbb‘,
‘qer‘=>‘bbb‘,
‘qad‘=>‘bbb‘,
‘asz‘=>‘bbb‘,
‘gda‘=>‘bbb‘,
‘abc‘=>‘bbb‘,
‘vbv‘=>‘bbb‘,
‘ewq‘=>‘bbb‘,
‘tew‘=>‘bbb‘,
],
],
],
],
]
];
$time = microtime_float();
echo ‘first start: ‘.$time."
";
//for ($i = 0 ; $i<5000000; $i++) {
//
// a($arr);
//}
a($arr);
$end = microtime_float();
echo ‘first end:‘.$end."
";
echo ‘value used:‘.bcsub($end , $time,4);
echo "
";
echo "
";
echo "
";
$time = microtime_float();
echo ‘second start:‘.$time."
";
//for ($i = 0 ; $i<5000000; $i++) {
// b($arr);
//}
b($arr);
$end = microtime_float();
echo ‘second end:‘.$end."
";
echo ‘second used:‘.bcsub($end,$time,4);
echo "
";
测试方法：
watch -n 1 -d php test.php
// 输出
first start: 1539332451.0195
first end:1539332451.0197
value used:0.0002
second start:1539332451.0198
second end:1539332451.0198
second used:0.0000
first start: 1539332463.6168
first end:1539332463.6169
value used:0.0001
second start:1539332463.6169
second end:1539332463.6169
second used:0.0000结论：
- 传引用的性能要高于传值，特别是传递的值比较大的时候，性能会很明显。这是因为传引用只是复制了地址（一个16进制数）
- 并发的瓶颈一般不会再php，而是在框架、在数据库。
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