blocks|key|758560|text|file_get_contents()接受一个文件名，而不是一个文件指针，所以你应该使用file_get_contents('file.txt')并去掉fopen调用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|758561|http://php.net/manual/en/function.file-get-contents.php|758562|然后，$file的值是一个字符串，它将文件的所有内容作为一个字符串包含在内。所以你可以使用普通的字符串操作，而不需要任何feof的东西。|758563|无论您如何想要查看file()，它可能对您很有用：|758564|http://php.net/manual/en/function.file.php|758565|编辑：|758566|你的逻辑也有问题。|758567|您将首先检查用户名，然后再检查密码，这是一个单独的操作。这将使任何用户与任何用户的密码匹配。假设用户alice的密码为"foo"，bob的密码为"bar"，按照当前的逻辑，alice将能够使用"foo“或"bar”作为密码登录。|758568|因此，您实际上要查找的是一个字符串，它是用户名和密码的串联，就像在文件中找到的那样(例如"alice+foo".PHP_EOL)：|758569|if+(strpos($file,+"$user+$password".PHP_EOL)+!==+false)+{
++++//+go+to+login+page
}+else+{
++++//+error
}|code-block|syntax|javascript|758570|您需要其中的PHP_EOL的原因是，这是您用来标记记录结尾的mark。如果您没有将其放入搜索字符串中，那么您将匹配实际密码的任何子字符串，包括空密码。(该文件包含文本"alice+foo".PHP_EOL，还包含文本"alice+"，但不包含文本"alice+".PHP_EOL)。|758571|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|J|18|T|24|5|0|0|1J|0|0|3|5|1O|4|0|9|6|0|0|16|1|0|0|0|0|18|J|0|0|6|7|2B|J|30|8|3F|G|0^^$0|@$1|2|3|4|5|6|7|1A|8|@$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]|$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1H|8|@]|D|@$9|1I|A|1J|1|1K]]|E|$]]|$1|H|3|I|5|6|7|1L|8|@$9|1M|A|1N|B|C]|$9|1O|A|1P|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1Q|8|@$9|1R|A|1S|B|C]]|D|@]|E|$]]|$1|L|3|M|5|6|7|1T|8|@]|D|@$9|1U|A|1V|1|1W]]|E|$]]|$1|N|3|O|5|6|7|1X|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1Y|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|1Z|8|@]|D|@]|E|$]]|$1|T|3|U|5|6|7|20|8|@$9|21|A|22|B|C]]|D|@]|E|$]]|$1|V|3|W|5|X|7|23|8|@]|D|@]|E|$Y|Z]]|$1|10|3|11|5|6|7|24|8|@$9|25|A|26|B|C]|$9|27|A|28|B|C]|$9|29|A|2A|B|C]|$9|2B|A|2C|B|C]]|D|@]|E|$]]|$1|12|3|-4|5|6|7|2D|8|@]|D|@]|E|$]]]|13|$14|$5|15|16|17|E|$18|G]]|19|$5|15|16|17|E|$18|M]]]]

<code>file_get_contents()</code> takes a filename, not a file pointer, so you should use <code>file_get_contents('file.txt')</code> and get rid of the <code>fopen</code> call.

<a href="http://php.net/manual/en/function.file-get-contents.php" rel="nofollow">http://php.net/manual/en/function.file-get-contents.php</a>

Then, the value of <code>$file</code> is a string containing all the contents of the file as a single string. So you can use normal string operations and don't need any of that <code>feof</code> stuff.

However you may want to look at <code>file()</code>, it is probably useful to you:

<a href="http://php.net/manual/en/function.file.php" rel="nofollow">http://php.net/manual/en/function.file.php</a>

EDIT:

You also have a problem with your logic.

You are checking the username first and then the password as a separate operation. This will match any user with any user's password. Let's say we have users alice with password "foo", and bob with password "bar", well with the current logic, alice will be able to login with either "foo" or "bar" as password.

So what you are actually looking for is a single string which is the concatenation of the username and the password, as it is found in the file (e.g. <code>"alice foo".PHP_EOL</code>):

<pre><code>if (strpos($file, "$user $password".PHP_EOL) !== false) {
 // go to login page
} else {
 // error
}
</code></pre>

The reason you need the <code>PHP_EOL</code> in there is that this is what you have used to mark the end of the record. If you don't put it in the search string, then you will match any substring of the real password, including an empty password. (The file contains the text <code>"alice foo".PHP_EOL</code> and it contains the text <code>"alice "</code> but it does not contain the text <code>"alice ".PHP_EOL</code>).

blocks|key|760777|text|问题出在这里：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|760778|$fp+=+fopen+("file.txt",+"r");+//+read+from+file
$file+=+file_get_contents($fp);|code-block|syntax|javascript|760779|使用fopen，您可以逐行读取文件；使用file_get_contents，您可以通过将文件名指定为参数而不是文件句柄来获取字符串形式的整个文件内容。|offset|length|style|CODE|760780|你把两者都搞混了。|760781|entityMap^0|0|0|2|5|K|H|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]|$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

The problem is here:

<pre><code>$fp = fopen ("file.txt", "r"); // read from file
$file = file_get_contents($fp);
</code></pre>

Using <code>fopen</code> you can read the file line by line and using <code>file_get_contents</code> you get the entire file contents as a string by specifying the file name as argument not a file handle.

You have mixed up both.

blocks|key|1992640|text|因为你正在学习，所以我不会给你代码，但可以给你逻辑通过"\n“分解，然后通过空格分解结果数组值|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1992641|检查数组值0和1是否等于用户名和密码，如果相同，则成功|1992642|如有任何疑问，请随时询问|1992643|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

since you are learning, I won't give you code, but can give you logic
explode through "\n"
then explode the result array value through space

check if that array values 0 and 1 are equal to username and password, if same then success

Still have any doubts feel free to ask

blocks|key|760806|text|引号内的php变量将只表现为字符串$_SESSION‘’username‘=“$user”；像这样使用$_SESSION’‘username’=$user；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|760807|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

php variables inside quotes will act like only string
 $_SESSION['username']="$user";
use it like this $_SESSION['username']=$user;

Hi im creating a simple log in system. I'm aware the way im doing is completely unsafe but its just for learning purposes, since im new to php. I'm having trouble with the validation, right now its not reporting if the username or password exists in the txt file. I also gonna use sessions(not fully implemented) to keep track if a user is logged in or not.

<pre><code> &lt;?php 
 session_start(); // session


 if(isset($_POST['register'])) // Register USER
 {
 $user = $_POST['username'];
 $password=$_POST['password'].PHP_EOL;
 $fh = fopen("file.txt","a+");
 fwrite($fh,$user." ".$password); //write to txtfile
 fclose($fh);
 }
</code></pre>

The output in the txt file looks like this:

<pre><code> user1 password1
 user2 password2
</code></pre>

This is where i need help

<pre><code> if(isset($_POST['Login']))
 {
 $_SESSION['username']=$user; 
 $_SESSION['password']=$password;

 $file = file_get_contents("file.txt");



 if (strpos($file, "$user $password".PHP_EOL) !== false) 
 {
 // go to login page
 }
 else 
{ 
 //ERROR
}

 ?&gt;
</code></pre>

php check for matches in txt file

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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您好，我创建了一个简单的登录系统。我知道这样做是完全不安全的，但这只是为了学习的目的，因为我是php的新手。我在验证时遇到了问题，现在它不会报告用户名或密码是否存在于txt文件中。我还将使用会话(未完全实现)来跟踪用户是否登录。 <?php session_start(); // sessi...

问php检查txt文件中的匹配项
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