用php替换文本文件中的valuie

我有一个具有以下设计的文本文件：

约翰·史密斯| 1|john@smith.com|无密码管理
汤姆·史密斯| 3|tom@smith.com|admin123|用户

等等。 每个字段都由“|”分隔。 我需要做的是替换此文本文件中的值，例如用户的密码或帐户类型

汤姆·史密斯|5|tom@smith.com|admin1234|管理

我成功地找到了行并使用explode（）将其吐出，但是如何修改该值并将其写回文本文件

$name = $_POST['name'];
$mydb = file('./DB/users.txt');
foreach($mydb as $line) {
    if(stristr($line,$name)) $pieces = explode("|", $line);
    $position = str_replace(array("\r\n","\r"),"",$pieces[1]);
    $email = str_replace(array("\r\n","\r"),"",$pieces[2]);
    $password = str_replace(array("\r\n","\r"),"",$pieces[3]);
    $atype = str_replace(array("\r\n","\r"),"",$pieces[4]); 

---

PHP提供了读取、写入和附加到文件的选项

您需要打开该文件，读取其中的所有内容，然后覆盖该文件。您将使用append获得重复的条目

下面是一个示例代码，来自：

对于您的代码：

<?php
  $name = $_POST['name'];
  $mydb = file('./DB/users.txt'); 

  $output = array();
  foreach($mydb as $line) { 
    if(stristr($line,$name)) {
      $pieces = explode("|", $line); 
      $position = str_replace(array("\r\n","\r"),"",$pieces[1]); 
      $email = str_replace(array("\r\n","\r"),"",$pieces[2]); 
      $password = str_replace(array("\r\n","\r"),"",$pieces[3]); 
      $atype = str_replace(array("\r\n","\r"),"",$pieces[4]); 

      // Glue the variables back together and overwrite $line so that it gets up in the array
      $line = $name & "|" $position & "|" $email & "|" $password & "|" $atype & "\r";
    }
    // put everything in the $output array so that it can be writen to file after this loop
    array_push($output, $line);
  }
  fclose($mydb);

  // Write your output to file
  $mydb = fopen('./DB/users.txt', "w") or die("Unable to open file!");
  foreach($output as $line) { 
    fwrite($mydb, $line);
  }
  fclose($mydb);
?>

---

有多种方法可以做到这一点。这里有一条路。我对代码进行了注释，以解释它是如何工作的

$name = $_POST['name'];

// use FILE_IGNORE_NEW_LINES so you won't have to deal with the line breaks
$mydb = file('./DB/users.txt', FILE_IGNORE_NEW_LINES);

// use a reference (&$line) so the code in your foreach loop modifies the $mydb array
foreach ($mydb as &$line) {
    if (stristr($line,$name)) {

        // assign the elements of the row to variables
        list($name, $number, $email, $password, $type) = explode('|', $line);

        // change whatever you need to change
        $password = 'new password';
        $type = 'new type';

        // overwrite the line with the modified values
        $line = implode('|', [$name, $number, $email, $password, $type]);

        // optional: break out of the loop if you only want to do the replacement
        // for the first item found that matches $_POST['name']
        break;
    }
};

// overwrite the file after the loop
file_put_contents('./DB/users.txt',  implode("\n", $mydb));

---

你能把你现有的代码放在这里吗？你是想全部修改它们，还是修改一个特定的代码？还有，你考虑过使用数据库吗？这看起来更像是数据库的作业。$name=$\u POST['name']$mydb=file（'./DB/users.txt'）；foreach（$line形式的mydb）{if（stristr（$line，$name））$pieces=explode（“|“，$line）；$position=str_replace（数组（“\r\n”，““\r”），”，“，”，$pieces[1]）；$email=str replace（数组（“\r\n”，““，”\r”），“，”，“$pieces[3]）$atype=str replace（数组(“\r\n”、“\r”）、“，$pieces[4]）；}一个数据库没关系，但这更容易使应用程序在工作时可移植。

$name = $_POST['name'];

// use FILE_IGNORE_NEW_LINES so you won't have to deal with the line breaks
$mydb = file('./DB/users.txt', FILE_IGNORE_NEW_LINES);

// use a reference (&$line) so the code in your foreach loop modifies the $mydb array
foreach ($mydb as &$line) {
    if (stristr($line,$name)) {

        // assign the elements of the row to variables
        list($name, $number, $email, $password, $type) = explode('|', $line);

        // change whatever you need to change
        $password = 'new password';
        $type = 'new type';

        // overwrite the line with the modified values
        $line = implode('|', [$name, $number, $email, $password, $type]);

        // optional: break out of the loop if you only want to do the replacement
        // for the first item found that matches $_POST['name']
        break;
    }
};

// overwrite the file after the loop
file_put_contents('./DB/users.txt',  implode("\n", $mydb));