Question

$username = $_GET['username'];
$steps = $_GET['id'];
$myfile = fopen("save/" . $username . ".txt", "w") or die("Unable to open file!");
fwrite($myfile, $steps);
fclose($myfile);
echo $steps;

这是我的代码，问题是它只用$ step替换整个.txt文件，Test1|b7f2b0b64a3c60a367b40b579b06452d|Male|0|a|02/05/2016|1在文本文件中，因此它最终只是32 {{1在文本文件中，我想将if $steps = 32;替换为0

提示我知道这样的事情

$steps = $_GET['id'];

Answer 1

这是因为您要使用$steps完全替换文件的内容，而$_GET['id']只包含$username = $_GET['username']; $steps = $_GET['id']; $myfile = fopen("save/" . $username . ".txt", "w") or die("Unable to open file!"); //explode on the | $userData = explode('|', stream_get_contents($myfile)); //This should be the steps data. Replace it with the new value $userData[3] = $steps; //put the exploded string back together with the new steps value fwrite($myfile, implode("|", $userData)); fclose($myfile);。

如果您确定步骤始终位于同一位置，那么您的爆炸性想法可以为此目的而努力。然后它会有点像这样。

fopen

但是，对于这些小文件，

fclose和$username = $_GET['username']; $steps = $_GET['id']; $myfile = file_get_contents("save/$username.txt"); //explode on the | $userData = explode('|', $myfile); //This should be the steps data. Replace it with the new value $userData[3] = $steps; //put the exploded string back together with the new steps value file_put_contents("save/$username.txt", implode("|", $userData));是非常激烈的操作。一种可能更快的方式（也更容易！）是这样做的：

$variables

P.S。您可以在双"字符串中使用<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Example - example-$route-service-production</title> <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.5.5/angular.min.js"></script> <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.5.5/angular-route.js"></script> <script src="script.js"></script> <script type="text/javascript"> angular.element(document.getElementsByTagName('head')).append(angular.element('<base href="' + window.location.pathname + '" />')); </script> </head> <body ng-app="ngRouteExample"> <div ng-controller="MainController"> Choose: <a href="Book/Moby">Moby</a> | <a href="Book/Moby/ch/1">Moby: Ch1</a> | <a href="Book/Gatsby">Gatsby</a> | <a href="Book/Gatsby/ch/4?key=value">Gatsby: Ch4</a> | <a href="Book/Scarlet">Scarlet Letter</a><br/> <div ng-view></div> <hr /> <pre>$location.path() = {{$location.path()}}</pre> <pre>$route.current.templateUrl = {{$route.current.templateUrl}}</pre> <pre>$route.current.params = {{$route.current.params}}</pre> <pre>$route.current.scope.name = {{$route.current.scope.name}}</pre> <pre>$routeParams = {{$routeParams}}</pre> </div> </body> </html>。

Answer 2

请注意，您使用的是w文件模式，该模式会在打开文件时截断该文件。这意味着，如果您没有先将数据放在一边，将丢失数据。根据{{3}}：

仅供写作;将文件指针放在文件的开头，将文件截断为零长度。如果该文件不存在，请尝试创建它。

使用the documentation，您可以先读取数据，然后将整个字符串保存回文件：

$username = $_GET['username'];
$steps = $_GET['id'];
$myfile = fopen("save/" . $username . ".txt", "r+") or die("Unable to open file!");

// Get the current data from the file
$data = fgetcsv($myfile, 0, '|');

// Now replace the 4th column with our steps
$data[3] = $steps;

// Now truncate the file
ftruncate($myfile, 0);

// And save the new data back to the file
fwrite($myfile, implode('|', $data));
fclose($myfile);

如何在文本文件的中间写入fwrite（）

2 个答案: