(PHP Extension) Remove an Entry from an Existing ZIP Using DeleteEntry

This example demonstrates how to use the DeleteEntry method to remove a file from an existing ZIP archive.

The example:

• Creates a ZIP archive containing three text files
• Opens the ZIP archive for modification
• Finds and deletes one entry
• Writes the modified ZIP archive to a new filename

Suppose the original ZIP archive contains:

a.txt
b.txt
c.txt

After deleting b.txt, the modified ZIP archive contains:

a.txt
c.txt

The entry is removed only from the in-memory ZIP object until a Write* method is called.

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

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<?php

include("chilkat.php");

$success = false;

$success = false;

// ------------------------------------------------------------
// First create a ZIP archive containing three text files.

$zip = new CkZip();

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

$charset = 'utf-8';

$success = $zip->AddString('a.txt','Contents of file A',$charset);
if ($success == false) {
    print $zip->lastErrorText() . "\n";
    exit;
}

$success = $zip->AddString('b.txt','Contents of file B',$charset);
if ($success == false) {
    print $zip->lastErrorText() . "\n";
    exit;
}

$success = $zip->AddString('c.txt','Contents of file C',$charset);
if ($success == false) {
    print $zip->lastErrorText() . "\n";
    exit;
}

// Write the ZIP archive to disk.
// 
// The ZIP now contains:
// 
//     a.txt
//     b.txt
//     c.txt
// 
$success = $zip->WriteZipAndClose();
if ($success == false) {
    print $zip->lastErrorText() . "\n";
    exit;
}

// ------------------------------------------------------------
// Open the existing ZIP archive for modification.

$zip2 = new CkZip();

$success = $zip2->OpenZip('original.zip');
if ($success == false) {
    print $zip2->lastErrorText() . "\n";
    exit;
}

// Find the entry named "b.txt".
$entry = new CkZipEntry();

$success = $zip2->EntryOf('b.txt',$entry);
if ($success == false) {
    print $zip2->lastErrorText() . "\n";
    exit;
}

// Remove the entry from the in-memory ZIP object.
// 
// At this point, the original ZIP file on disk is unchanged.
// The deletion takes effect only after WriteZip or
// WriteZipAndClose is called.
$success = $zip2->DeleteEntry($entry);
if ($success == false) {
    print $zip2->lastErrorText() . "\n";
    exit;
}

// Write the modified ZIP archive to a new file.
$zip2->put_FileName('modified.zip');

$success = $zip2->WriteZipAndClose();
if ($success == false) {
    print $zip2->lastErrorText() . "\n";
    exit;
}

// The modified ZIP now contains:
// 
//     a.txt
//     c.txt
// 

print 'ZIP archive updated successfully.' . "\n";

?>