# 常见PHP配置文件修改
使用PHP应用程序的时候，php组件的启用或停用、邮件设置、上传文件大小等控制都会涉及修改php配置文件。本镜像php配置文件的安装目录为： /etc/php.ini
下面是一些与安装相关的php参数：
* memory\_limit – **Minimum:** 256M //默认内存
* upload\_max\_filesize – **Minimum:** 20M //上传文件最大值
* post\_max\_size – **Minimum:** 20M //通过POST提交数据的最大值
* max\_execution\_time: **At Least** 120 **Recommended:** 300 //PHP最大执行时间
需要修改上述参数的值，只需要通过SFTP打开php.ini，修改（“#”在前的项表示没有启用，请根据实际情况删除“#”），然后保存
保存后还需要重启http服务才能生效，重启命令如下：
```
~# systemctl restart httpd
```
如果您不会使用命令操作，通过云服务器后台去重启服务器也可以达到同样的效果。
## [实例：如何修改上传文件大小限制？](/bt-linux-image-guide/bt-bao-ta-mian-ban-jing-xiang-shou-ce-linux-1/chang-jian-php-pei-zhi-wen-jian-xiu-gai.md#1301)
通过SFTP修改 /etc/php.ini 如下的部分
```
; Maximum size of POST data that PHP will accept.
post_max_size = 16M
; Maximum allowed size for uploaded files.
upload_max_filesize = 16M
```
保存后，重启http服务
```
~# systemctl restart httpd
```
如果您不会使用命令操作，通过云服务器后台去重启服务器也可以达到同样的效果。
## [实例：如何修改系统最大响应时间？](/bt-linux-image-guide/bt-bao-ta-mian-ban-jing-xiang-shou-ce-linux-1/chang-jian-php-pei-zhi-wen-jian-xiu-gai.md#1302)
我们在运行应用程序的时候，常常会等待很长的时间之后，却收到这样的错误提示 “Maximum execution time of 30 seconds exceeded”。这种情况下就需要通过修改the max\_execution\_time（最大执行响应时间）的值来解决这个问题。
**方法一（推荐）:** 通过SFTP修改 /etc/php.ini 如下的部分
```
; Maximum execution time of each script, in seconds
; http://php.net/max-execution-time
; Note: This directive is hardcoded to 0 for the CLI SAPI
max_execution_time = 90
; Maximum amount of time each script may spend parsing request data. It's a good
; idea to limit this time on productions servers in order to eliminate unexpectedly
; long running scripts.
```
**方法二:** 如果应用程序支持 .htaccess，请修改它:
```
php_value max_execution_time 90
```
保存后，重启http服务
```
~# systemctl restart httpd
```
如果您不会使用命令操作，通过云服务器后台去重启服务器也可以达到同样的效果。
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