How to modify txt file in php

How to modify txt files in php: This can be achieved through the fwrite() function. The fwrite() function can write the specified content to an open file. The function will stop running when the specified length is reached or the end of the file is read. Function syntax: [fwrite(file, string, length)].

To modify the txt file, there are two situations:

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1. If there is only one line of data in the txt file, the method is as follows:

$fp = fopen("password.txt", "w");//文件被清空后再写入
if($fp)
{
     $flag=fwrite($fp,$password);
     if(!$flag)
     {
          echo "写入文件失败<br>";
          break;
     }
}
fclose($fp);

2. If there are multiple lines of data in the txt file, the method is as follows:

$path="wifi_customer_settings.txt";
$wifissid2=$_POST['wifissid'];
$wifipwd2=$_POST['wifipwd'];
$arr=array("wifiSSID=".$wifissid2,"\n","wifiPWD=".$wifipwd2);
$fp=fopen($path, 'w');
fputs($fp,$arr[0]);
fputs($fp,$arr[1]);
fputs($fp,$arr[2]);
fclose($fp);

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