使用 php 替换特定的行或单词

Question

有谁知道如何使用下面的 php 示例文件名替换文件特定行中的特定行或单词或数字

server.cfg

game dm
plugins etc etc etc
ports 2345

那么 php 可以只更新端口号吗？使用任何形式或东西？会有帮助的

Answer 1

以下是分步解决方案，每行都有说明。

注意：server.cfg 必须是 PHP 可写的。确保设置权限，以便 PHP 可以首先写入该文件。否则，您将收到“无法打开流：权限被拒绝”错误。

// Define the path to the file here
$myFile = '/path/to/server.cfg';

// Define the new port number here
$newPort = '12345';
$newGameMode = 'cool';
$newMaxPlayers = 120;

// Load the file
$contents = file_get_contents($myFile);

// Modify the contents
$contents = preg_replace('/(ports) (\d+)/', '$1 '.$newPort, $contents);
$contents = preg_replace('/(gamemode) ([a-z]+)/', '$1 '.$newGameMode, $contents);
$contents = preg_replace('/(maxplayers) (\d+)/', '$1 '.$newMaxPlayers, $contents);

// Overwrite the file with the new contents
file_put_contents($myFile, $contents);

Answer 2

很好，但我怎么能用多行示例来做到这一点

$newport = $_POST['ports'];
$newgamemode = $_POST['gamemode'];
$newmaxplayers = $_POST['maxplayers'];
$contents = file_get_contents($myFile);
$contents = preg_replace('/(ports) (\\d+)/', '$1 '.$newport, $contents);
$contents = preg_replace('/(gamemode) (\\d+)/', '$1 '.$newgamemode, $contents);
$contents = preg_replace('/(maxplayers) (\\d+)/', '$1 '.$newmaxplayers, $contents);
file_put_contents($myFile, $contents);```

the current cfg file looks like this 
gamemode asdsad
plugins discord04rel64 announce04rel64 
ports 100
sqgamemode scripts/main.nut
maxplayers 100