Detailed explanation of how to change the hosts file in PHP

This article mainly introduces the method of changing the hosts file in PHP, and analyzes the related reading, setting, deletion and other implementation techniques of PHP operating the hosts file based on specific examples. Friends in need can refer to the following

The example in this article describes the method of changing the hosts file in PHP. I share it with you for your reference. The details are as follows:

There is such a requirement. I have multiple URLs that I hope will correspond to different IPs at different times. If I configure hosts one by one, this work seems a bit cumbersome. I wrote the following script to make batch changes.

<?php
define(&#39;HOST_FILE&#39;, &#39;C:\Windows\System32\drivers\etc\hosts&#39;);
$hm = new HostManage(HOST_FILE);
$env = $argv[1];
if (empty($env)) {
    $hm->delAllGroup();
} else {
    $hm->addGroup($env);
}
class HostManage {
    // hosts 文件路径
    protected $file;
    // hosts 记录数组
    protected $hosts = array();
    // 配置文件路径，默认为 __FILE__ . &#39;.ini&#39;;
    protected $configFile;
    // 从 ini 配置文件读取出来的配置数组
    protected $config = array();
    // 配置文件里面需要配置的域名
    protected $domain = array();
    // 配置文件获取的 ip 数据
    protected $ip = array();
    public function __construct($file, $config_file = null) {
        $this->file = $file;
        if ($config_file) {
          $this->configFile = $config_file;
        } else {
          $this->configFile = __FILE__ . &#39;.ini&#39;;
        }
        $this->initHosts()
            ->initCfg();
    }
    public function __destruct() {
        $this->write();
    }
    public function initHosts() {
        $lines = file($this->file);
        foreach ($lines as $line) {
            $line = trim($line);
            if (empty($line) || $line[0] == &#39;#&#39;) {
                continue;
            }
            $item = preg_split(&#39;/\s+/&#39;, $line);
            $this->hosts[$item[1]] = $item[0];
        }
        return $this;
    }
    public function initCfg() {
        if (! file_exists($this->configFile)) {
            $this->config = array();
        } else {
            $this->config = (parse_ini_file($this->configFile, true));
        }
        $this->domain = array_keys($this->config[&#39;domain&#39;]);
        $this->ip = $this->config[&#39;ip&#39;];
        return $this;
    }
    /**
     * 删除配置文件里域的 hosts
     */
    public function delAllGroup() {
        foreach ($this->domain as $domain) {
            $this->delRecord($domain);
        }
    }
    /**
     * 将域配置为指定 ip
     * @param type $env
     * @return \HostManage
     */
    public function addGroup($env) {
        if (! isset($this->ip[$env])) {
            return $this;
        }
        foreach ($this->domain as $domain) {
            $this->addRecord($domain, $this->ip[$env]);
        }
        return $this;
    }
    /**
     * 添加一条 host 记录
     * @param type $ip
     * @param type $domain
     */
    function addRecord($domain, $ip) {
        $this->hosts[$domain] = $ip;
        return $this;
    }
    /**
     * 删除一条 host 记录
     * @param type $domain
     */
    function delRecord($domain) {
        unset($this->hosts[$domain]);
        return $this;
    }
    /**
     * 写入 host 文件
     */
    public function write() {
        $str = &#39;&#39;;
        foreach ($this->hosts as $domain => $ip) {
            $str .= $ip . "\t" . $domain . PHP_EOL;
        }
        file_put_contents($this->file, $str);
        return $this;
    }
}

The sample configuration file is as follows:

# 域名
[domain]
a.example.com=1 # 请无视这个 =1，因为使用了 parse_ini_file 这个函数来解析，如果后面不带值，就获取不到这条记录了
b.example.com=1
c.example.com=1
# ip 记录
[ip]
local=127.0.0.1
dev=192.168.1.100

Usage:

php hosts.php local # 域名将指向本机 127.0.0.1
php hosts.php dev # 域名将指向开发机 192.168.1.100
php hosts.php # 删除域名的 hosts 配置

After I finished writing, I found that this is clearly a job that can be completed with just one search and replace

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