Php 按顺序将数据写入文本文件

我对PHP非常陌生，我只是在玩PHP

我通过ajax post到php从表单中获取数据，数据被添加到文本文件中，我想将这些数据按顺序排列

像

现在它像这样被添加，没有任何数字

  username , emailid , etc  
  username , emailid , etc

下面是我的PHP代码

<?php
    //print_r($_POST);
    $myFile = "feedback.txt";
    $fh = fopen($myFile, 'a') or die("can't open file");
    $comma_delmited_list = implode(",", $_POST) . "\n";
    fwrite($fh, $comma_delmited_list);
    fclose($fh);
?>

试试这个：

<?php

    //print_r($_POST);
    $myFile = "feedback.txt";

    $content  = file_get_contents($myFile);
    preg_match_all('/(?P<digit>\d*)\)\s/', $content, $matches);
    if(empty($matches['digit'])){
      $cnt  = 1;
    }
    else{
      $cnt  = end($matches['digit']) + 1;
    }

    $fh = fopen($myFile, 'a') or die("can't open file");
    $comma_delmited_list = $cnt.") ".implode(",", $_POST) . "\n";
    fwrite($fh, $comma_delmited_list);
    fclose($fh);
?>

这允许您添加新条目，并根据“自然”顺序对所有条目进行排序；i、 e.人类最有可能将元素放入的顺序：

→ 第1部分：逐行读取.txt文件

# variables:
    $myFile = "feedback.txt";
    $contents = array(); # array to hold sorted list

# 'a+' makes sure if the file does not exists, it is created:
    $fh = fopen( $myFile, 'a+' ) or die( "can't open file" ); 

# while not at the end of the file:
    while ( !feof( $fh ) ) { 

        $line = fgets( $fh ); # read in a line

        # if the line is not empty, add it to the $contents array:
        if( $line != "" ) { $contents[] = $line; } 

    } 
    fclose($fh); # close the file handle

→ 第2部分：添加新条目和“自然”排序列表

# add new line to $contents array
    $contents[] = implode( ",", $_POST );

# orders strings alphanumerically in the way a human being would
    natsort( $contents ); 

→ 第3部分：将排序后的行写入.txt文件

# open txt file for writing:
    $fh = fopen( $myFile, 'w' ) or die( "can't open file" ); 

# traverse the $contents array:
    foreach( $contents as $content ) { 

         fwrite( $fh, $content . "\n" ); # write the next line 

    }
    fclose($fh); # close the file handle

# done! check the .txt file to see if it has been sorted/added to!

让我知道它是如何工作的。
您的代码缺少该号码。是什么阻止您添加它？在哪里？如何添加数字？请检查打印（$matches['digit']）看看接下来会发生什么它只是打印数组（）哦，我很抱歉，它是
preg\u match\u all（'/（？P\d*）\）\s/，$content，$matches）
我写了
$filename
而不是
$content
。我编辑了代码请现在检查
# open txt file for writing:
    $fh = fopen( $myFile, 'w' ) or die( "can't open file" ); 

# traverse the $contents array:
    foreach( $contents as $content ) { 

         fwrite( $fh, $content . "\n" ); # write the next line 

    }
    fclose($fh); # close the file handle

# done! check the .txt file to see if it has been sorted/added to!