//github上下载https://github.com/facebook/xhprof
unzip xhprof-master.zip 
cd xhprof-master/extension/
/usr/local/php/bin/phpize
./configure --with-php-config=/usr/local/php/bin/php-config --enable-xhprof
make && make install

[xhprof]
extension=xhprof.so
xhprof.output_dir=/tmp

//xhprof下载压缩包中的xhprof_html和xhprof_lib
cp -r xhprof-master/xhprof_html /usr/local/nginx/html/xhprof/
cp -r xhprof-master/xhprof_lib /usr/local/nginx/html/xhprof/

server{
 listen 80;
 server_name will.com;
 location / {
  root /usr/local/nginx/html;
  index index.html;
 }
 location ~ \.php$ {
  root html;
  fastcgi_pass 127.0.0.1:9000;
  fastcgi_index index.php;
  fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
  include  fastcgi_params;
 }
 }

//需要安装graphviz否则查看性能图片时候会报failed to execute cmd: " dot -Tpng". stderr: `sh: dot: command not found '
yum -y install graphviz

//入口文件的开始位置
xhprof_enable(XHPROF_FLAGS_MEMORY | XHPROF_FLAGS_CPU);

业务逻辑...

//业务逻辑结束后
$xhprof_data = xhprof_disable();
include_once "/usr/local/nginx/html/xhprof/xhprof_lib/utils/xhprof_lib.php"; 
include_once "/usr/local/nginx/html/xhprof/xhprof_lib/utils/xhprof_runs.php"; 
$objXhprofRun = new XHProfRuns_Default();//数据会保存在php.ini中xhprof.output_dir设置的目录去中 
$run_id = $objXhprofRun->save_run($xhprof_data, "test");

<?php
xhprof_enable(XHPROF_FLAGS_MEMORY | XHPROF_FLAGS_CPU);
function show($info)
{
 echo "<pre>";
 print_r($info);
}

//不作数据校验
$rules = array(
 2=>array('min'=>1, 'max'=>10, 'chance'=>30),//金额:分 概率:百分之(默认为100%,不足100%按第一档计算)
 array('min'=>11, 'max'=>25, 'chance'=>60),
 array('min'=>26, 'max'=>50, 'chance'=>10),
 array('min'=>50, 'max'=>80, 'chance'=>0),
 array('min'=>80, 'max'=>100, 'chance'=>0),
);
$total_money = 10000;//红包总金额
$res = array();
while($total_money>0)
{
 $index = getLevel($rules);
 $money = setMoney($rules, $index);
 if ($money > $total_money)//金额不足
 {
 $money = $total_money;
 $total_money = 0;
 } else {
 $total_money -= $money;
 }
 $res[] = ($index+1)."---".$money;
}
echo show($res);
echo $total_money . "<br/>";
//1.先确定档次
function getLevel($rules)
{
 $level = array();
 $chance = 0;
 foreach($rules as $k=>$v)
 {
 if ($v['chance']>0)
 {
  $chance += $v['chance']*100;//扩大100倍
  $level[$k] = $chance;
 }
 }
 $index = 0;
 $rand_num = mt_rand(1, 10000);
 foreach($level as $k=>$v)
 {
 if ($rand_num <= $v)
 {
  $index = $k;
  break;
 }
 }
 return $index;
}
//2.确定档次之后，再确定金额
function setMoney($rules, $index)
{
 $money = mt_rand($rules[$index]['min']*10000, $rules[$index]['max']*10000)/10000;
 $money = ceil($money);
 $money > 1 && $money = $money -1;//防止出现免单情况
 return $money;
}
$xhprof_data = xhprof_disable();
include_once "/usr/local/nginx/html/xhprof/xhprof_lib/utils/xhprof_lib.php"; 
include_once "/usr/local/nginx/html/xhprof/xhprof_lib/utils/xhprof_runs.php"; 
$objXhprofRun = new XHProfRuns_Default();//数据会保存在php.ini中xhprof.output_dir设置的目录去中 
$run_id = $objXhprofRun->save_run($xhprof_data, "test");
echo "http://will.com/xhprof/xhprof_html/index.php?run=$run_id&source=test";//变量$runId是本次请求生成分析结果的id，最后我们输出了一个链接地址，使用改地址就可以看到本次请求的分析结果。