Get Zip File Index From Filename in PHP

ZIP archives are a common way to compress and package files in a single file. Sometimes, we may need to extract information about a specific file within a ZIP archive, such as its index, in order to perform further operations on that file, for example replacing a file requires the file index. PHP provides the ZipArchive class, which allows to work with ZIP archives.

The statName() method of the ZipArchive class can be used to retrieve information about a specific file within the archive, including its index.

Here's how to get the index of a file from its name:

<?php

$zipPath = 'path/to/archive.zip'; // Replace with the path to your ZIP archive
$fileName = 'example.txt'; // Replace with the name of the file whose index you want to get

// Create a new instance of ZipArchive
$zip = new ZipArchive();

// Open the ZIP archive
if ($zip->open($zipPath) === true) {
  // ZIP archive opened successfully

  // Get the index of the file within the archive
  $fileStat = $zip->statName($fileName);

  if ($fileStat) {
    $fileIndex = $fileStat['index'];
    echo "Index of '$fileName' in '$zipPath' is: $fileIndex";
  } else {
    echo "File '$fileName' not found in '$zipPath'.";
  }

  // Close the ZIP archive
  $zip->close();
} else {
  echo "Failed to open '$zipPath'.";
}
?>

• The open() method takes the path to the ZIP archive as its argument and returns a boolean value indicating whether the archive was successfully opened or not.
• The statName() method takes the name of the file as its argument and returns an associative array containing information about the file, such as its index, size, compressed size, modification time, and more.