How to modify the configuration file in php?

How to modify the configuration file in php?

How to modify the configuration file in php:

1. Modify the boot page first

<?php
include("dbconfig.php");
?>
<form action="edit.php" method="post">
    <br />
    端口：<input type="text" name="DB_HOST" value="<?php echo DB_HOST;?>" /><br />
    用户名：<input type="text" name="DB_USER" value="<?php echo DB_USER;?>" /><br />
    密码：<input type="text" name="DB_PASS" value="<?php echo DB_PASS;?>" /><br />
    数据库名：<input type="text" name="DB_NAME" value="<?php echo DB_NAME;?>" /><br />
    <input type="submit" value="修改" />
</form>

2. Modify the page

<?php
//获取配置文件的内容
$string = file_get_contents(&#39;config.php&#39;);
foreach ($_POST as $key=>$value) {
    //正则匹配对应的一行
    $old_inf = "/define\(&#39;$key&#39;,&#39;.*?&#39;\);/";
    //要修改成的数据
    $new_inf = "define(&#39;$key&#39;,&#39;$value&#39;);";
    //替换
    $string = preg_replace($old_inf,$new_inf,$string);
}
//写入配置文件
file_put_contents(&#39;config.php&#39;,$string);
echo "修改成功";

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