How to modify the file timestamp of the compressed package through PHP ZipArchive?

How to modify the file timestamp of the compressed package through PHP ZipArchive?

Introduction:
ZipArchive is a built-in class of PHP used to create, add, extract and modify ZIP compressed files. However, the ZipArchive class has some limitations in modifying the timestamp of ZIP files. This article will introduce how to modify the file timestamp in the compressed package through PHP ZipArchive, and provide code examples.

Steps:
The following are the steps to modify the file timestamp in the compressed package through PHP ZipArchive:

1. Create a ZipArchive object and open the ZIP to be modified File:

   $zip = new ZipArchive;
   if ($zip->open('example.zip') === true) {
     // 文件打开成功，继续后续操作
   } else {
     // 文件打开失败，处理错误逻辑
   }

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2. Traverse all files in the ZIP file and get their index in the ZIP file:

   $fileIndex = array();
   for ($i = 0; $i < $zip->numFiles; $i++) {
     $fileIndex[$i] = $zip->getNameIndex($i);
   }

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3. The timestamp of the modified file :

   $file = 'path_to_file_within_zip';
   $timestamp = time(); // 设置新的时间戳
   
   $index = array_search($file, $fileIndex); // 获取文件在ZIP中的索引
   if ($index !== false) {
     // 找到文件，修改时间戳
     $zip->setIndex($index);
     $zip->setArchiveModifiedTime($timestamp);
     $zip->close();
   } else {
     // 文件不存在，处理错误逻辑
   }

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4. Save and close the modified ZIP file:

   $zip->close();

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Full sample code:

function modifyZipFileTimestamp($zipFile, $file, $timestamp) {
  $zip = new ZipArchive;
  if ($zip->open($zipFile) === true) {
    $fileIndex = array();
    for ($i = 0; $i < $zip->numFiles; $i++) {
      $fileIndex[$i] = $zip->getNameIndex($i);
    }
    
    $index = array_search($file, $fileIndex);
    if ($index !== false) {
      $zip->setIndex($index);
      $zip->setArchiveModifiedTime($timestamp);
      $zip->close();
      return true;
    }
    
    $zip->close();
  }
  
  return false;
}

// 使用示例
$zipFile = 'example.zip';
$file = 'path_to_file_within_zip';
$newTimestamp = strtotime('2022-01-01 00:00:00');
if (modifyZipFileTimestamp($zipFile, $file, $newTimestamp)) {
  echo '文件时间戳修改成功！';
} else {
  echo '文件时间戳修改失败！';
}

Summary:
Through the PHP ZipArchive class, we can easily modify the file timestamp in the ZIP compressed file. This article describes the steps to modify the timestamp of a ZIP file using the ZipArchive class and provides complete sample code. I hope this article will be helpful to developers who need to modify the timestamp of ZIP files in PHP.

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