测试代码
<?php
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:{$this->time}秒<br />";
echo "memory:{$this->memory}<br />";
}
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];
}
}
$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();
测试结果
php 5.6.32 运行结果
memory:68.85 mb
time:0.5407851秒
php 7.2.1 运行结果
memory:16 mb
time:0.191808秒