来自文件的PHP总和 [英] PHP Sum from a file

问题描述

我在这里仍在学习使用PHP进行编码，此刻我已经遇到了一个问题.

I'm here still learning to code with PHP, and I've got into one question at the moment.

我有一个.txt文件，说"results.txt"，其中包含5个不同的选项，后面带有数字.这些代表着来自5个不同选项的投票.布局是这样的:

I have a .txt file, say "results.txt" which contains 5 different options with a number behind. these represents like a voting from 5 different options. The layout is like this:

1|3
2|6
3|2
4|8
5|10

阶梯数是选项获得的票数.

The ladder number is how many votes the options has got.

我需要做的是对票数求和，将其增加1，然后回显结果:

What I need to do is to sum the votes, increase it by 1 and then echo the result:

echo "Total votes: 30 votes"

在这种情况下.

用于投票的表格是您的普通表格，有5种不同的选择:

The form which is used to voting is your normal and simple form with 5 different options:

<form action="aanestys.php" method="get">
Choose an option: 
<select name="vote">
<option value=1 selected>1</option> 
<option value=2>2</option>
<option value=3>3</option>
<option value=4>4</option>
<option value=5>5</option>
</select>
<br>
<input type="submit" value="Send">          
</form>

您对此有任何提示或建议吗?我不一定需要一个直接的答案，因为我确实想学习使用fopen，fgets和fwrite命令，而不仅仅是复制/粘贴代码.

Do you have any tips or advice on how to do this? I don't necessarily need a straight answer because I do want to learn to use the fopen, fgets and fwrite commands and not just copy/paste codes.

看来，投票投给了通过表格选择的选项.并且.txt文件必须是最新的.到目前为止，我已经知道了:

It seems that the vote goes to an option which is selected with the form. And also that the .txt file must be up-to-date about it. So far I've got this:

<?php
$lines = file("results.txt");
$vote = $_GET['vote'];
$summa = 0;
$val = array();

foreach($lines as $line) {
$var;
$var = explode("|", $line);
if ($vote == $var[0]){
    $var[1]++;
    array_push($val, $var[0], "|", $var[1]);
} else {
    array_push($val, $var[0], "|", $var[1]);
}
$summa = $summa += $var[1];
}
$ulos = implode("\n", $val) . "\n";
//Somehow, because this is an exercise, the checker says this is right 
//although it's totally not even close to it.

echo "Total votes: $summa votes.";

file_put_contents("results.txt", $ulos);
?>

但是投票计数不正确.怎么了?

But the vote count isn't right. What's wrong about this?

推荐答案

使用 explode() 用定界符"|"将其相加，并通过每次加($var[1])将和存储在$sum中.

Open the file with file(), loop through the lines, explode() it with the delimiter "|", and store the sum in $sum by adding ($var[1]) everytime.

<?php
$lines = file('file.txt');
$sum = 0 ;

foreach ($lines as $line){
$var = explode("|", $line);
$sum = $sum +  $var[1];
}

echo $sum+1; //outputs 30
?>

希望这会有所帮助.

这篇关于来自文件的PHP总和的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！