如何在PHP中将重复数据输入限制为文本文件中的现有数据？_Php_Html

如何在PHP中将重复数据输入限制为文本文件中的现有数据？

php html

如何在PHP中将重复数据输入限制为文本文件中的现有数据？,php,html,Php,Html,我有一个名为“names.txt”的文本文件，名字像约翰、迈克、朱莉娅。现在，我以附加模式在现有的“names.txt”文件中输入另一组名称，如Steve、Ben、Mike。如何限制php中的“Mike”重复项？或者，我如何提示一条错误消息，比如“Mike，name已经存在”。请输入另一个名称“以便避免重复” 代码是 <!DOCTYPE html> <html> <head> <title>Form Page</title>

我有一个名为“names.txt”的文本文件，名字像约翰、迈克、朱莉娅。现在，我以附加模式在现有的“names.txt”文件中输入另一组名称，如Steve、Ben、Mike。如何限制php中的“Mike”重复项？或者，我如何提示一条错误消息，比如“Mike，name已经存在”。请输入另一个名称“以便避免重复”

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);
}

?>


表格页

最好的方法可能是

逐行读取文本文件并将其加载到数组中

通过数组循环，将每个值与新给定的值（新名称）进行比较-这可以使用in_array（）完成

如果为false，则添加；如果为true，则返回错误

使用

PHP\u EOL

分隔文本文件条目时：（请注意，

PHP\u EOL

的输出取决于PHP运行的操作系统！）

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";
}

?>

/*names.txt
迈克
彼得
路易斯
汉密尔顿
*/
表格页


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

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

发布你的代码以提供帮助。嗨，卢卡斯·亨里克，我已经发布了代码。请检查。@Latchu我发布了一个新的解决方案，请试用。只需将explode（）函数中的分隔符替换为您使用的分隔符即可。似乎您正在使用“PHP\u EOL”->explode（PHP\u EOL，$file\u content）；现在更改了我的答案以适应您更新的问题。请注意——“PHP_EOL”取决于PHP代码运行的操作系统。
//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";

/* 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";
}

?>

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

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