PHP下载按钮无法工作生成空文件

问题描述

我在表单中有两个按钮，一个是提交，第二个按钮下载textarea中显示的输出。

I have two button in the form, one is to submit and second button download the output shown in the textarea.

提交工作正常，但下载按钮创建空文件并且不写输出文本区域的数据。

The submit works fine but download button create empty file and does not write data of output text area.

这是代码：

Here is code:

<?php
error_reporting(0);
$mytext = "";

$txt = preg_replace('/\n+/', "\n", trim($_POST['inputtext']));
$text = explode("\n", $txt);
$output  = array();


if(isset($_POST["submit"]))
{
    for($i=0;$i<count($text);$i++)
    {
        $output[] .= trim($text[$i]) . ' Text added with output'.PHP_EOL;
    }
}


if(isset($_POST["download"]) ) {

    $handle = fopen("file.txt", "w");
    fwrite($handle, implode($output));
    fclose($handle);

    header('Content-type: application/octet-stream');
    header('Content-Disposition: attachment;filename='.basename('file.txt'));
    header('Expires: 0');
    ob_end_clean();
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize('file.txt'));
    readfile('file.txt');
    exit;
}
?>


<form method="POST" action="test.php">
<textarea name="inputtext" rows="10" cols="100" placeholder="Enter Any Text!" required><?php if(!empty($_POST["inputtext"])) { echo $_POST["inputtext"]; } ?></textarea>
<br><br>
<input type="submit"  name="submit" value="Do it!">
<br><br>
<p>Output goes here. </p><textarea name="oputputtext" rows="10" cols="100" ><?php echo implode($output);?></textarea>
<input type="submit"   name="download" value="Download Output">
</form>

推荐答案

你从第二个textarea取得它），所以使用 if（isset（$ _ POST [submit]）|| isset（$ _ POST [download]）） in测试，而不是只有 if（isset（$ _ POST [submit]））

You have to generate the output also if downloading (unless you take it from the second textarea), so use if(isset($_POST["submit"]) || isset($_POST["download"]) ) in the test, instead of only if(isset($_POST["submit"]))

最终代码看起来像这样：

The final code would look like this:

<?php

error_reporting(0);
$mytext = "";

$txt = preg_replace('/\n+/', "\n", trim($_POST['inputtext']));
$text = explode("\n", $txt);
$output  = array();


/* CHANGED HERE */

if(isset($_POST["submit"]) || isset($_POST["download"]) ) {


    for($i=0;$i<count($text);$i++) {

        $output[] .= trim($text[$i]) . ' Text added with output'.PHP_EOL;

    }

}


if(isset($_POST["download"]) ) {

    $handle = fopen("file.txt", "w");
    fwrite($handle, implode("\r",$output));
    fclose($handle);

    header('Content-type: application/octet-stream');
    header('Content-Disposition: attachment; filename='.basename('file.txt'));
    header('Expires: 0');
    ob_end_clean();
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize('file.txt'));
    readfile('file.txt');
    exit;
}

?>


<form method="POST" action="test.php">
    <textarea name="inputtext" rows="10" cols="100" placeholder="Enter Any Text!" required><?php if(!empty($_POST["inputtext"])) { echo $_POST["inputtext"]; } ?></textarea>
    <br><br>
    <input type="submit"  name="submit" value="Do it!">
    <br><br>
    <p>Output goes here. </p>
    <textarea name="oputputtext" rows="10" cols="100" ><?php echo implode($output);?></textarea>
    <input type="submit"   name="download" value="Download Output">
</form>

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