Question

我对编程的了解仅限于面向对象的语言，所以请耐心等待。

我已经为用户创建了一个表单，可以对他们最喜欢的教授进行投票。表格的一列应显示教授的姓名，另一列应显示有多少人投票。

如果以前没有输入过教授的名字，那么会创建一个新行，该教授的投票数为1.如果教授的名字有< / em>之前已输入，然后投票计数应递增。

我使用逗号来区分姓名和投票数。

我很可能在这里做错了什么，但这是我迄今为止所做的。它不起作用，因为像我说的那样，我完全不了解PHP。

<?php $name = $_POST["name"]; $file = fopen("vote.txt", "r+"); $copy = false; foreach($file as $row){ list($nameOrig,$countOrig) = explode(',', $row); if($nameOrig == $name){ $countNew = $countOrig + 1; preg_replace($countOrig,$countNew,$string); $copy = true; break; } } if($copy == false){ fwrite($file, $name); fwrite($file, ','); fwrite($file, '1'); } fclose($file); ?>

示例文件：

Doe,1 Smith,3 Clark,1 John,8

警告：

Warning: fopen(vote.txt): failed to open stream: Permission denied in /index.php on line 20 Warning: Invalid argument supplied for foreach() in /index.php on line 24 Warning: fwrite() expects parameter 1 to be resource, boolean given in /index.php on line 37 Warning: fwrite() expects parameter 1 to be resource, boolean given in /index.php on line 38 Warning: fwrite() expects parameter 1 to be resource, boolean given in /index.php on line 39 Warning: fwrite() expects parameter 1 to be resource, boolean given in /index.php on line 40 Warning: fwrite() expects parameter 1 to be resource, boolean given in /index.php on line 41 Warning: fclose() expects parameter 1 to be resource, boolean given in /index.php on line 44

我知道一个事实，vote.txt位于正确的位置，因为/vote.txt显示了该文件。

Answer 1

我创建了一个完成这项工作的php脚本，即使不建议将数据存储在txt文件中，你仍然可以这样做。

我写的所有代码目前都可用，如果你把它全部放在一个php文件中，就在这里：

<form method="post">
    <input type="text" name="name">
    <input type="submit">
</form>
<?php
if(isset($_POST['name'])){ //if post name is set it means vote button was pressed
    $name = $_POST["name"]; //get name in the input field
    $file = fopen("vote.txt", "r+"); //open the file, in this case the txt file must be located in the same folder as this php file
    $fileContent = file_get_contents("vote.txt"); //get current content of txt file
    $teachers = (explode("\n",$fileContent)); //file has a line break (\n) at the end of every vote so create an element in an array called teachers for every line break
    $exists = false; //for future use
    $valueMatch; //if teacher exists save the string of his name and vote count in this variable
    foreach($teachers as $key => $value){ //check if teacher exists
        $parts = explode(",", $value); //create an array of items containing the name and votes of a record
        if($parts[0]==$name){ //$parts[0] contains the name of the current teacher, if matches with the name in the input it means it exists
            $exists = true; //for future use
            $valueMatch = $value; //value that the loop had at the moment of the match
        }
    }
    if($exists){ //if teacher exists
        $parts = explode(",", $valueMatch);
        $curentVotes = (int)$parts[1]; //put current votes in an int variable
        $newStr = $parts[0] . ", " . (++$curentVotes); //new string will contain the same string with a vote added
        $fileContent =  str_replace($valueMatch, $newStr, $fileContent); //the new file content //change the old vote for the new vote
        fwrite($file, $fileContent); //rewrite the file with the new vote
        echo "You voted for teacher " . $name . ". Current teacher votes: " . $curentVotes; //print feedback message
    }else{ //doesn't exist so add to the list
        $txt = $name . ", 1"; //teacher name plus comma and vote number of 1
        $myfile = file_put_contents('vote.txt', $txt.PHP_EOL , FILE_APPEND | LOCK_EX); //append txt to the file
        echo "The teacher " . $name . " was added to the votes list. Current teacher votes: 1"; //print feedback message
    }
    fclose($file); //close file
}
?>

我测试了代码并且它工作得非常好。

备注

这可能需要改进，例如验证一些东西

在某些情况下您可能会遇到一些问题

我发现，在测试代码时，我打开了txt文件，当添加记录时，它被添加到我打开文件时的插入位置

该脚本区分大小写，因此在记录中您可以找到Ana和ana作为2个不同的记录，即使它们可以引用同一个老师

<强>更新

在清理代码时，我搞砸了一部分，我不会工作，我发布了这样但现在已经修复了。

我希望它对你有所帮助，来自墨西哥的问候！

如果用户输入的数据是表单中现有数据的副本，如何用PHP用用户输入的数据替换部分文本文件？

1 个答案: