测试版本：
旧版 PHP 5.5.29 ，新版 PHP 7.0.0
测试方法：
class PerformanceTest
{
private $time;
private $memory;
public function begin()
{
$this->time = $this->getTime();
$this->memory = $this->getMemory();
}
public function end()
{
$this->time = $this->getTime() - $this->time;
$this->time = round($this->time,7);//在这里才能格式化时间
$this->memory = $this->getMemory() - $this->memory;
$this->memory = $this->convert($this->memory);
echo "time:{$this->time}秒
";
echo "memory:{$this->memory}
";
}
public function getTime()
{
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
public function getMemory()
{
return memory_get_usage();
}
public function convert($size)
{
$unit=array('b','kb','mb','gb','tb','pb');
return @round($size/pow(1024,($i=floor(log($size,1024)))),2).' '.$unit[$i];
}
}1.生成五十万个数组，并查询五十万次 key 是否存在
$a = array();
$b = new PerformanceTest();
$b->begin();
for($i=0;$i<500000;$i++){
$a[$i] = $i;
}
foreach($a as $i)
{
array_key_exists($i, $a);
}
$b->end();
/***
php 5.5n
time:0.131秒
memory:40.15 mb
php 7.0n
time:0.0780001秒
memory:14 mb
***/测试结果如下：
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➜ time php test.php
php test.php
0.60s user
0.05s system
98% cpu
0.667 total
➜ time /usr/local/php7/bin/php test.php
/usr/local/php7/bin/php test.php
0.05s user
0.02s system
92% cpu
0.073 total
PHP7 速度是 PHP5.5 的 9 倍
2. 生成五十万个数组，并查询五十万次 value 是否存在
$a = array();
$b = new PerformanceTest();
$b->begin();
for($i=0;$i<10000;$i++){
$a[$i] = $i;
}
foreach($a as $i)
{
in_array($i, $a);
}
$b->end();
/***
php 5.5n
time:0.6560001秒
memory:845.49 kb
php 7.0n
time:0.095秒
memory:388 kb
***/➜ time php test.php
php test.php
0.79s user
0.01s system
99% cpu
0.809 total
➜ time /usr/local/php7/bin/php test.php
/usr/local/php7/bin/php test.php
0.08s user
0.01s system
97% cpu
0.091 total
PHP7 速度是 PHP5.5 的 8.7 倍
