apache_event_php-fpm 示意圖：
nginx-php-fpm示意圖：
##Worker-Master-Server
# TCP-Nginx_PHP
#Nginx-FastCGI
#1、使用$_GET 取得所有參數，php7 會多出一個參數：_url ，例如存取的位址
http://127.0.0.1/Home/String/index2?a=12&b=19
Error：PHP Notice: Undefined index: HTTP_USER_AGENT in line 2 #php5.9則為一個notice
2017/03/27 10:58:09 [error] 5286#0: *851 FastCGI sent in stderr: "PHP message: PHP Notice: Undefined index: HTTP_USER_AGENT in /home/UserAgent.php on line 9" while reading response header from upstream
解決：http://stackoverflow.com/questions/16330496/php-notice-undefined-index-http- user-agent-in-line-2if(!empty($_SERVER['HTTP_USER_AGENT'])){
$user_agent = $_SERVER['HTTP_USER_AGENT'];
} else {
$user_agent = '';
}NULL
合併運算符，PHP7才正式加入了??這個運算子：
// 获取user参数的值(如果为空，则用'nobody') $username = $_GET['user'] ?? 'nobody'; // 等价于: $username = isset($_GET['user']) ? $_GET['user'] : 'nobody';
2017/03/31 20:56:19 [crit] 19288#0: *1 connect() to unix:/var/run/php7.0.9-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: www.phalcon3.com, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php7.0.9-fpm.sock:", host: "127.0.0.1"
tinywan@tinywan:/usr/local/nginx/logs$ ll /var/run/php7.0.9-fpm.soc ls: 无法访问'/var/run/php7.0.9-fpm.sock': 没有那个文件或目录
以上是PHP5.9 升級到PHP7 遇到的一些坑（php-fpm 圖解）的詳細內容。更多資訊請關注PHP中文網其他相關文章！
