nginx中fastcgi_pass(转发到php解释器php-fpm)

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nginx处理请求index.php过程

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URL
 ↓
Nginx location 匹配
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root / alias
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fastcgi_param SCRIPT_FILENAME
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php-fpm 执行

2.php典型 Nginx 配置

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server {
    listen 80;
    server_name example.com;

    root /var/www/public;

    location ~ \.php$ {
        include fastcgi_params;
        fastcgi_pass unix:/run/php-fpm/www.sock;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    }
}

请求：

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/hello.php

Nginx 计算出：

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$document_root = /var/www/public
$fastcgi_script_name = /hello.php

最终传给 php-fpm：

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/var/www/public/hello.php