Question

我需要从txt文件中删除特定的字符串集。目前，代码以类似的方式工作以将数据直接发布到文件。但是，尝试删除以相同方式输入的相同数据将不允许它。在它的当前状态下，代码看起来像是删除字符串。

我们 NOT 允许使用预建的排序函数或使用str_replace或类似代码等函数。

以下是删除字符串的当前代码：

        $blankReplace = "";
        $found = false;
        $fileData = file($fileInput,FILE_IGNORE_NEW_LINES);
        for($i = 0; ($i < count($fileData)) && != $found; $i ++)
        {
            if($fullNameAndEmail == $fileData[$i])
            {
                $pos = $i;
                $name = $fileData[$i];
                $found = true;
            }
        }
        if($found == true)
        {
            // Exit path. Go to for($j = 0) path
            unset($fileData[$pos]);
            shuffle($fileData);
        }
        else
        {
            //Error Msg
        }
        $writeToFile = fopen($inputFile,'w+');
        for($j = 0;$j<count($fileData);$j++)
        {
               if(trim($fileData[$j]) != " ")
               {
                   $rewrittenList = trim($fileData[$j])."\n";
                   fwrite($writeToFile, $rewrittenList);


               }
        }

在研究错误时，代码在代码中输出T_IS_NOT_EQUAL的错误。数据来自file（）读取的直接数据，因此它应该可以工作。该错误当前指向for($i = 0; ($i < count($fileData)) && != $found; $i ++)行，但也可能引用代码中的类似事件。

数据以以下格式输入：

firstname lastname emailaddress

我还需要能够处理上述名称的多个实例，所以我们有：

Matt Person emailaddr@email.com
Matt Person emailaddr@email.com

在与此类似的情况下，它将删除一个实例，而不是全部。

感谢任何帮助，感谢您提前的时间。

编辑：

Example input:
Matthew person person@email.com
John holton person@email.com
Person Name person@gmail.com

用户将输入一个人的姓名（格式如上），这将导致删除一个人。说他们输入表格：

$fullName = "Matthew person";
$emailAddr = "person@email.com";
The output will edit the data to put the data into a single line again
$fullNameAndEmail = $firstName." ".$lastName." ".$emailAddr;

代码的输出，在此示例中将删除“Matthew person person@email.com”

因此文本文件中的输出将输出：

John holton person@email.com
Person Name person@gmail.com

编辑2：代码处于当前状态

<!doctype HTML>
<html>
<meta charset="utf-8">
<head>
<title>Updating the guest book!</title>
</head>

<body>
<?php


$fileInput = "guestBook.txt";
$fileInputInData = file_get_contents($fileInput);   // Gets data from file
$testBool = file_exists($fileInput);
$fullName = trim($_POST["fullName"]);
$emailAddr = trim($_POST["emailAddr"]);
$fileSize = filesize($fileInput);

if(!empty($fullName) and !empty($emailAddr))
{
    if($testBool == 0)
    {
        echo "There was an issue with the file. Please have it checked.</br>";
    }
    else
    {   
        echo "Made it into else path for testBool </br>";
        if($fileSize > 0)
        {   #code for truth
            echo "Made it into filesize check. Filesize: $fileSize </br>";


            $fullNameLen = strlen($fullName);
            $emailAddrLen = strlen($emailAddr);
            $fullNameArr = explode(" ", $fullName);
            $firstName = trim($fullNameArr[0]);
            $lastName = trim($fullNameArr[1]);
            $fullNameToWrite =$firstName." ".$lastName;
            $emailAddrCheck=substr_count($emailAddr, "@");
            if ($emailAddrCheck == 1) 
            {
                echo "Email address check passed</br>";
                #email addr entered right path
                $fullNameAndEmail =$fullNameToWrite." ".$emailAddr." has signed in.\n";
                $inputFile = "guestBook.txt";
                //$pos = strpos($writeToFile, $fullNameAndEmail);
                //$writeToFileEx = explode("\n", $fileInputInData);
                $blankReplace = "";
                $str = $fileInputInData;
                $find = $fullNameAndEmail;
                $arr=explode("\n", $str);
                Foreach($arr as $key => &$line)
                {
                    If($line == $find)
                    {
                        Unset($arr[$key]);
                        shuffle($arr);
                    }
                }
                $writeToFile = fopen($inputFile,'w+');
                $rewrittenList = trim($arr)."\n";
                fwrite($writeToFile, $rewrittenList);
                fclose($inputFile);
            }
            else            {
                echo "Email address check failed. Invalid email address entered. </br>
                        Line 55 occured.</br>";
                #email addr entered wrong message
            }
                //asort(array) sorts array low to high (ascending)
                //arsort(array) sorts array high to low (descending)

        }
        else
        {
            echo "Did not make it into filesize check. Filesize: $fileSize. Line 63 occured </br>";
        }
    }
}
else if (empty($fullName) or empty($emailAddr))
{
    echo "Error! Line 23: One of the inputs was left empty. Line 69 occured </br>";
}
else
{
    echo "Error! Line 23: Did not detect any values in either data area,</br>and program
     did not go into first error. Line 73 occured </br>";
}

?>
<br>
</body>
</html>

Answer 1

我认为你过于复杂了我预先确定每一行并检查它是否匹配如果是的话，我取消了该行。

在循环之后，我在新行上内爆，字符串恢复正常，但没有$ find。

$str = "Matt Person emailaddr@email.com
John doe doesoe@gmail
Matt Person emailaddr@email.com
Trump donald@whitehouse";

$find = "Matt Person emailaddr@email.com";

$arr=explode("\n", $str);

Foreach($arr as $key => &$line){

    If($line == $find){
        Unset($arr[$key]);
    }
}
Echo implode("\n", $arr);

https://3v4l.org/hmSr7

Php：从文本文件中删除字符串

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