ps aux | grep 'php' | grep -v 'php-fpm'

[tabalt@localhost ~] sudo strace -p 13793
Process 13793 attached - interrupt to quit

[tabalt@localhost ~] sudo netstat -tunpa | grep 13793
tcp  0  0 192.168.1.100:38019  192.168.1.101:3306  ESTABLISHED 13793/php
tcp  0  0 192.168.1.100:47107  192.168.1.102:6379  CLOSE_WAIT 13793/php 

tcpdump -i eth0 host 192.168.1.101 and port 3306 -w ~/mysql.cap

 echo getmypid(); sleep(10); 

//...
poll([{fd=4, events=POLLIN|POLLERR|POLLHUP}], 1, 1471228928) = 1 ([{fd=4, revents=POLLIN}])
recvfrom(4, "://xxx.com/\0\0\23jiadia"..., 271, MSG_DONTWAIT, NULL, NULL) = 271
poll([{fd=4, events=POLLIN|POLLERR|POLLHUP}], 1, 1471228928) = 1 ([{fd=4, revents=POLLIN}])
recvfrom(4, "_b?ie=UTF8&node=658390051\0\0008www."..., 271, MSG_DONTWAIT, NULL, NULL) = 206

select * from sites where type = 1 limit 50;
select * from sites where type = 2 limit 50;

echo("start foreach\n");
foreach($types as $type)
{
 echo("foreach $type\n");
 $result[$type] = $this->getSites($type);
}
echo("end foreach\n"); 

start foreach
foreach 1
foreach 2

$sites = array(); // 省略从数据库查询的代码
$siteNum = 8;  // 省略从配置读的代码
$urlKeys = $result = array();
for($i = 0; $i < $siteNum; $i++)
{
 do {
  $site = array_shift($sites);
  $urlKey = md5($site['url']);
 } while(array_key_exists($urlKey, $urlKeys));

 $urlKeys[$urlKey] = 1;
 $result[] = $site;
}
return $result;