(PHP Extension) Find a ZIP Entry by EntryID Using EntryById

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This example demonstrates how to use the EntryById method to retrieve a ZIP entry using its unique EntryID.

Each ZipEntry object has an EntryID property that uniquely identifies the entry within the currently open ZIP object.

This is useful when:

• An application stores EntryID values for later use
• ZIP entries need to be retrieved without searching by filename
• Multiple entries may have similar names or paths

The example:

• Opens a ZIP archive
• Retrieves an entry using EntryAt
• Saves the entry's EntryID
• Uses EntryById to retrieve the same entry later

Note: This example requires Chilkat v11.0.0 or greater.

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<?php

include("chilkat.php");

$success = false;

$success = false;

// Open an existing ZIP archive.
$zip = new CkZip();

$success = $zip->OpenZip('example.zip');
if ($success == false) {
    print $zip->lastErrorText() . "\n";
    exit;
}

// Retrieve the first entry in the ZIP archive.
$entry = new CkZipEntry();

$success = $zip->EntryAt(0,$entry);
if ($success == false) {
    print $zip->lastErrorText() . "\n";
    exit;
}

print 'Original entry:' . "\n";
print '  FileName: ' . $entry->fileName() . "\n";
print '  EntryID: ' . $entry->get_EntryID() . "\n";
print '' . "\n";

// Save the EntryID for later use.
$entryId = $entry->get_EntryID();

// Create another ZipEntry object.
$entry2 = new CkZipEntry();

// Retrieve the same entry using EntryById.
$success = $zip->EntryById($entryId,$entry2);
if ($success == false) {
    print $zip->lastErrorText() . "\n";
    exit;
}

print 'Entry retrieved by EntryID:' . "\n";
print '  FileName: ' . $entry2->fileName() . "\n";
print '  EntryID: ' . $entry2->get_EntryID() . "\n";
print '' . "\n";

// The filenames and EntryID values should match.
$zip->CloseZip();

print 'Done.' . "\n";

?>