Question

我有一个名字.txt＆＃39;文本文件的名称，如约翰，迈克，朱莉娅。现在我在附加模式中输入另一组名称到现有的名称.txt＆＃39;档案像史蒂夫，本，迈克。我怎样才能限制麦克＆＃39;在php中重复输入？或者我如何提示错误消息，例如Mike，名字已经存在。请输入其他名称＆＃39;这样可以避免重复。

代码是

<!DOCTYPE html>
<html>
<head>
<title>Form Page</title>    
</head>
<body>

<form action="Files.php" method="POST">
<textarea rows="15" cols="30" value="textbox" name="textbox"></textarea></br>
<input type="submit" value="Save" name="Save">
<input type="submit" value="Fetch" name="Fetch">
</form>

</body>
</html>

<?php

/*** Get names from 'names.txt' file and prints the names stored in it ***/
if(isset($_POST['Fetch'])){
    $file_names = "names.txt";
    $current_names = file_get_contents($file_names);
    echo nl2br($current_names); 
}

/*** Get names from text box and Put to the 'names.txt' file in append mode ***/
if(isset($_POST['Save'])){

    $current_names = $_POST["textbox"];
    file_put_contents("names.txt", PHP_EOL.$current_names, FILE_APPEND);

    /*** Get names form 'names.txt' file and prints the names stored in it ***/
    $file_names = "names.txt";
    $current_names = file_get_contents($file_names);
    echo nl2br($current_names);
}

?>

Answer 1

将文本文件条目与PHP_EOL分开时：（注意 - PHP_EOL的输出取决于运行PHP的操作系统！）

//new name to insert if not in file:
$new_name = "Martin";

$file_content = file_get_contents('names.txt');

//names into array elements
$content_array = explode(PHP_EOL, $file_content);

//trim spaces and stuff from the data in your array:
foreach($content_array AS $key => $value)
{
    $content_array[$key] = trim($value);
}


if(in_array($new_name, $content_array)) echo "name found - don't save it again";

Answer 2

可能最好的方法是

逐行阅读文本文件并将其加载到数组中
循环遍历数组，将每个值与新给定的值（新名称）进行比较 - 这可以使用in_array（）
如果为true，则添加false或echo错误。

Answer 3

<!DOCTYPE html>
<html>
<head>
<title>Form Page</title>
</head>
<body>

<form action="Files.php" method="POST">
<textarea rows="15" cols="30" value="textbox" name="textbox"></textarea></br>
<input type="submit" value="Save" name="Save">
<input type="submit" value="Fetch" name="Fetch">
</form>

</body>
</html>

<?php

/*** Get names from 'names.txt' file and prints the names stored in it ***/
if(isset($_POST['Fetch'])){
    $file_names = "names.txt";
    $current_names = file_get_contents($file_names);
    echo nl2br($current_names);
}

$currentNamesContainer = explode(PHP_EOL, $current_names);

/*** Get names from text box and Put to the 'names.txt' file in append mode ***/
if(isset($_POST['Save'])){

    $newName = $_POST["textbox"]; // changed variable name to NewName

    // If new name does not exist in current container, then just append it...otherwise bail!
    if (!in_array($newName, $currentNamesContainer)) {
        file_put_contents("names.txt", PHP_EOL.$newName, FILE_APPEND);
    }

    /*** Get names form 'names.txt' file and prints the names stored in it ***/
    $file_names = "names.txt";
    $current_names = file_get_contents($file_names);
    echo nl2br($current_names);
}

?>

算法： $ existingData = file_get_contents（'names.txt'）;

// Now parse this string and store names in an array (list of names), that depends on your format of file...

$yourNewName = 'Mike';

// Now check is this exists in your current array.

if (in_array($yourNewName, $currentArray)) {
   // exit with error
}

// Insert new name .

//This is pseudo code i have written. If you post your code, i can try more help.

Answer 4

试试这个：

/* names.txt 
mike
peter
louis
hamilton
*/


<!DOCTYPE html>
<html>
<head>
<title>Form Page</title>    
</head>
<body>

<form action="Files.php" method="POST">
<textarea rows="15" cols="30" value="textbox" name="textbox"></textarea></br>
<input type="submit" value="Save" name="Save">
<input type="submit" value="Fetch" name="Fetch">
</form>

</body>
</html>

<?php

/*** Get names from 'names.txt' file and prints the names stored in it ***/
if(isset($_POST['Fetch'])){
    $file_names = "names.txt";
    $current_names = file_get_contents($file_names);
    echo nl2br($current_names); 
}

/*** Get names from text box and Put to the 'names.txt' file in append mode ***/
if(isset($_POST['Save']) && !empty($_POST['textbox'])){

    $file_names = "names.txt";
    $current_names_onfile = file_get_contents($file_names);
    $current_names = $_POST["textbox"];
    $arr = explode("\r", $current_names);
    foreach($arr as $name)
    {
        #remove line breaks
        $name = preg_replace('/[\r\n]/m', '', $name);
        #if the name doesn't exist on file stores it.
       if (!preg_match("/^\b$name\b\$/m", $current_names_onfile)) {
       file_put_contents("names.txt", PHP_EOL.$name, FILE_APPEND);
       }else{
           echo "$name already exists<br />";
       }
    }
    /*** Get names form 'names.txt' file and prints the names stored in it ***/
    $file_names = "names.txt";
    $current_names = file_get_contents($file_names);
    echo nl2br($current_names);

   }else if(isset($_POST['Save'])){
    echo "please type something";
}

?>

Answer 5

这么简单..

$data   = file('names.txt', FILE_IGNORE_NEW_LINES);
$search = 'Jakarta';

echo (in_array($search, $data)) ? "Already exists" : "Available";

如何在PHP中的文本文件中限制重复数据输入到现有数据？

5 个答案: