PHP执行Shell脚本后显示生成文件内容的异常问题

Hey there! Let's work through this issue step by step. The problem you're facing—where the text.txt content doesn't update after running your shell script via a PHP button—usually boils down to permissions, PHP not waiting for the script to finish, or caching issues. Here's how to fix it:

By default, some PHP execution functions might not wait for long-running scripts to finish. Use exec() with output/return code tracking to ensure PHP waits until new_run.sh is done generating the file:

<?php
// Disable browser caching to avoid stale content
header("Cache-Control: no-cache, no-store, must-revalidate");
header("Pragma: no-cache");
header("Expires: 0");

if (isset($_POST['run_script'])) {
    $script_path = '/home/anas/kaldi/egs/voxforge/s5/new_run.sh';
    $output = [];
    $return_code = 0;

    // Capture both stdout and stderr to debug failures
    exec("$script_path 2>&1", $output, $return_code);

    // Check if the script ran successfully
    if ($return_code !== 0) {
        echo "<p>Script failed with return code $return_code:</p>";
        echo "<pre>" . htmlspecialchars(implode("\n", $output)) . "</pre>";
    }
}

// Read the latest file content
$result_file = '/home/anas/kaldi/egs/voxforge/s5/results/text.txt';
$content = '';
if (file_exists($result_file)) {
    // Clear PHP's file cache to ensure we get the latest version
    clearstatcache(true, $result_file);
    $content = file_get_contents($result_file);
}
?>

<form method="post">
    <button type="submit" name="run_script">Run Kaldi Script</button>
</form>

<div style="margin-top: 20px;">
    <h3>Latest Results:</h3>
    <pre><?php echo htmlspecialchars($content); ?></pre>
</div>

The user running PHP (usually www-data for Apache or nginx for Nginx) needs access to your script and output directory:

• Give the script execution permissions:

  chmod +x /home/anas/kaldi/egs/voxforge/s5/new_run.sh
  

• Ensure the PHP user can read/write to the results directory:

  # Option 1: Change ownership to the PHP user
  sudo chown -R www-data:www-data /home/anas/kaldi/egs/voxforge/s5/results/
  
  # Option 2: Open permissions (less secure, but quick for testing)
  sudo chmod -R 775 /home/anas/kaldi/egs/voxforge/s5/results/
  

• Also verify that new_run.sh doesn't rely on commands only your user (anas) can access—add full paths to any binaries in the script if needed.

First, run the script manually as your user to confirm it updates text.txt:

/home/anas/kaldi/egs/voxforge/s5/new_run.sh

Check if text.txt has fresh content after running. If it doesn't, the issue is with the shell script itself, not PHP.

Add this code right after reading the file to confirm if the file is actually being updated:

if (file_exists($result_file)) {
    clearstatcache(true, $result_file);
    echo "<p>File last modified: " . date("Y-m-d H:i:s", filemtime($result_file)) . "</p>";
    $content = file_get_contents($result_file);
}

If the timestamp doesn't change after clicking the button, the script isn't executing properly—go back to checking permissions or script output errors.

内容的提问来源于stack exchange，提问作者user7401447