【测试环境】

windows 8.1

wampserver 2.4

总共循环10次，每次测试1000000次，计算出每次循环的时间和总的时间，并且算出平均值

【测试代码】

点运算符性能测试代码：

$total = 1000000;
$loop = 10;
$a = ‘123‘;
$b = ‘456‘;
$c = ‘789‘;
$str = ‘‘;
$total_spend = 0;
for ($num=1; $num<=$loop; $num++) {
    $start = microtime(true);
    for ($i=0; $i<$total; $i++) {
        $str = $a . $b . $c;
    }
    $end = microtime(true);
    $spend = $end - $start;
    echo "loop $num: " . $spend .‘<br/>‘;
    $total_spend += $spend;
}
$avg = $total_spend / $loop;
echo ‘average spend: ‘ . $avg . ‘<br>‘;

双引号变量替换性能测试代码：

$total = 1000000;
$loop = 10;
$a = ‘123‘;
$b = ‘456‘;
$c = ‘789‘;
$str = ‘‘;
$total_spend = 0;
for ($num=1; $num<=$loop; $num++) {
    $start = microtime(true);
    for ($i=0; $i<$total; $i++) {
        $str = "{$a}{$b}{$c}";
    }
    $end = microtime(true);
    $spend = $end - $start;
    echo "loop $num: " . $spend .‘<br/>‘;
    $total_spend += $spend;
}
$avg = $total_spend / $loop;
echo ‘average spend: ‘ . $avg . ‘<br>‘;

【测试结果】

点运算符：

双引号变量替换：

【结论】

在php中，双引号变量替换的性能比点运算符的性能要好。

本文出自 “IT部落格” 博客，请务必保留此出处http://ljfrocky.blog.51cto.com/8715099/1378591

PHP点运算符和双引号变量替换的性能比较,布布扣,bubuko.com

PHP点运算符和双引号变量替换的性能比较