(PHP Extension) Unzip a Text File Entry into a StringBuilder Using ZipEntry.UnzipToSb

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This example demonstrates how to use the ZipEntry.UnzipToSb method to inflate a text file entry directly into a StringBuilder object.

The ZIP entry is uncompressed entirely in memory and appended to the StringBuilder without creating a temporary file on disk.

This is useful when:

• Processing text files directly in memory
• Avoiding temporary filesystem files
• Reading configuration files, JSON, XML, CSV, or source code from ZIP archives
• Automatically converting line endings while inflating the text

The srcCharset argument specifies how the uncompressed bytes should be interpreted, such as:

• utf-8
• utf-16
• windows-1252

The lineEndingBehavior argument controls line-ending conversion:

• 0 — Leave line endings unchanged
• 1 — Convert all line endings to bare LF
• 2 — Convert all line endings to CRLF

Suppose the ZIP archive contains:

config/settings.json

The example inflates the JSON file directly into a StringBuilder.

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<?php

include("chilkat.php");

$success = false;

$zip = new CkZip();

// Open an existing ZIP archive.
$success = $zip->OpenZip('qa_data/zips/configFiles.zip');
if ($success == false) {
    print $zip->lastErrorText() . "\n";
    exit;
}

// Locate the JSON file entry within the ZIP archive.
$entry = new CkZipEntry();

$success = $zip->EntryOf('config/settings.json',$entry);
if ($success == false) {
    print 'ZIP entry not found.' . "\n";
    $zip->CloseZip();
    exit;
}

// ------------------------------------------------------------
// Inflate the ZIP entry directly into a StringBuilder.
// 
// The uncompressed text is appended to the StringBuilder.
// 
$sb = new CkStringBuilder();

// Leave line endings unchanged.
$lineEndingBehavior = 0;

// Interpret the uncompressed bytes as UTF-8 text.
$srcCharset = 'utf-8';

$success = $entry->UnzipToSb($lineEndingBehavior,$srcCharset,$sb);
if ($success == false) {
    print $entry->lastErrorText() . "\n";
    exit;
}

print 'Uncompressed text:' . "\n";
print '' . "\n";
print $sb->getAsString() . "\n";

$zip->CloseZip();

print 'Done.' . "\n";

?>