如何编写一个函数来更改txt文件中确切用户的密码

Question

我有三个输入字段一个用于电子邮件另一个密码第三个是更改密码的字段但是在 txt 文件中我已经编写了代码但它不起作用我应该添加到我的代码中以更改确切用户的当前密码这在txt文件中已经不仅仅是一个，为什么我需要内爆和爆炸功能

 <?php
    if(isset($_POST['change_log'])){
    $fread2=[];
        $email =$_POST['email'];
        $old_password =$_POST['password'];
        $new_password =$_POST['new_password'];
        $file = fopen( "data.txt","w",FILE_SKIP_EMPTY_LINES|FILE_IGNORE_NEW_LINES );
        //  $file=fopen("data.txt","w") or die("Cannot open"); 
            if(filesize('data.txt')>0){
                $read=fread($file,filesize('data.txt'));
                $fread2=explode(" ",$read);
                fclose($file);

            }

            for($i=0;$i<count($fread2);$i++){
                if($fread2[$i] == $email){
                    $fread2==$email;
                    $i++;
                    if($fread2[$i]== $old_password){
                        $fread2==$new_password;
                    }
                //  $fread2 = implode(' ',$fread2);
                    $file = fopen("newfile.txt", "w") or die("Unable to open file!");
                    fwrite($file, $fread2);
                    fclose($file);

                }
                else{
                    echo 'Password does  not match ';
                }
                break;
            }
        }
    ?>

Answer 1

public function passAddOrChange($user, $pass)
{
    // $this->storage <--- path to file with <user:pass> data
    // json_last_error() != true, file_get_content() != false; 
    $passwords = (array)json_decode(file_get_contents($this->storage));
    $passwords[$user] = $pass;
    file_put_contents($this->storage, json_encode($passwords));
}

Answer 2

此功能可以满足您的要求，并添加了一些附加功能，如果您希望将来扩展代码，例如更新数据库，这将比存储在文本文件中容易得多。

p>

此答案假定您的 data.txt 文件具有如下结构：

user1.email@site.com password user2.email@site.com otherpassword

代码如下：

<?php

//Your variables
$email = $_POST['email'];
$old_password = $_POST['password'];
$new_password = $_POST['new_password'];

//Call the function to change the password
changePassword( $email, $old_password, $new_password );

function changePassword( $email, $old_password, $new_password){

    //The status will be updated to true if successful.
    //This function returns boolean.
    $status = false;

    //The new password can't have spaces
    if( strpos( $new_password, " " ) !== false ){
        return $status;
    }

    //Read the file.
    $file = fopen( "data.txt", "r+", FILE_SKIP_EMPTY_LINES | FILE_IGNORE_NEW_LINES );
    $read = fread( $file, filesize( "data.txt" ));

    //Close the file
    fclose( $file );

    //Explode the data. There are two values which make up a user, so chunk into users.
    $data = array_chunk( explode( " ", $read ), 2 );

    //The names of each element (purely to make code easier)
    $keys = array(
            "email",
            "password"
        );

    //For every user in the data file.
    foreach( $data as $userID=>$user ){
        //Combine the user data with keys
        $user = array_combine( $keys, $user );

        //If the current credentials are correct
        if( $user["email"] == $email && $user["password"] == $old_password ){
            //Change the password on this user
            $user["password"] = $new_password;

            //Update the user record
            $data[$userID] = $user;

            //We have changed the user password, change status
            $status = true;

            //Since we updated the user, we don't need to proceed through the loop
            break 1;
        }
    }

    //This is the output data
    $outputData = array();

    //Since we broke the array into users, we need to put it back into a 1d array
    foreach($data as $userID=>$user){
        $outputData[] = implode( ' ', $user );
    }

    //Implode the array so we can put it back in the file
    $outputData = implode( " ", $outputData );

    //Write the data to the file.
    file_put_contents( "data.txt", $outputData );

    //Return the status, which will be true.
    return $status;
}