Some pitfalls encountered when upgrading PHP5.9 to PHP7 (php-fpm diagram)

apache_event_php-fpm Schematic diagram:

nginx-php-fpm Schematic diagram:

Worker-Master-Server

TCP-Nginx_PHP

Nginx-FastCGI

1. Use $_GET to get all parameters. php7 will have one more parameter: _url, such as the accessed address

http://127.0.0.1/Home/String/index2?a=12&b=19

At this time, the parameter _url = "Home/String/index2"

2. In PHP7, it is an Error: PHP Notice: Undefined index: HTTP_USER_AGENT in line 2

php5.9 is a 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

Solution: http://stackoverflow.com/questions/16330496/php-notice-undefined-index-http- user-agent-in-line-2

if(!empty($_SERVER['HTTP_USER_AGENT'])){
  $user_agent = $_SERVER['HTTP_USER_AGENT'];    
} else {
  $user_agent = ''; 
}

3, NULL merge operator, PHP7 officially added the ?? operator:

// 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';

4. php-fpm The consequences of not starting

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

After working on it for a long time, it turns out that php-fmp has not started. The most important thing is to persist and believe in yourself.

Related Recommended: "PHP Tutorial"

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