(PHP ActiveX) Transition from BeginCompressStringENC to FirstChunk/LastChunk

Provides instructions for replacing deprecated BeginCompressStringENC method calls with using FirstChunk/LastChunk properties.

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

$success = 0;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$sbCompressedBase64 = new COM("Chilkat.StringBuilder");

$compress = new COM("Chilkat.Compression");
$compress->Algorithm = 'deflate';
$compress->Charset = 'utf-8';
$compress->EncodingMode = 'base64';

$sbIndex = new COM("Chilkat.StringBuilder");

// ----------------------------------------------------------------------------------
// This is the deprecated way of compressing in chunks using Begin/More/End methods..
// ----------------------------------------------------------------------------------

for ($i = 0; $i <= 24; $i++) {
    // Note: It is possible (and normal) for a BeginCompress* or MoreCompress* method to return
    // an empty string (or 0 bytes).  When this happens, the input data is not lost.  It will be flushed
    // in a subsequent call.
    $sbIndex->Clear();
    $sbIndex->AppendInt($i);
    if ($i == 0) {
        $sbCompressedBase64->Append($compress->beginCompressStringENC($sbIndex->getAsString()));
    }
    else {
        $sbCompressedBase64->Append($compress->moreCompressStringENC($sbIndex->getAsString()));
    }

    $sbCompressedBase64->Append($compress->moreCompressStringENC(': This is a line of data to be compressed...\r\n'));
}

// Flush any remaining output.
$sbCompressedBase64->Append($compress->endCompressStringENC());

print 'The base64 encoded compressed text:' . "\n";
print $sbCompressedBase64->getAsString() . "\n";

// Decompress in one call:
$originalText = $compress->decompressStringENC($sbCompressedBase64->getAsString());
print $originalText . "\n";

// ----------------------------------------------------------------------------------
// This is new way of compressing in chunks using FirstChunk and LastChunk properties
// ----------------------------------------------------------------------------------

$sbCompressedBase64->Clear();

$compress->FirstChunk = 1;
$compress->LastChunk = 0;

$bdCompressed = new COM("Chilkat.BinData");
$sbUncompressedChunk = new COM("Chilkat.StringBuilder");

for ($i = 0; $i <= 24; $i++) {
    if ($i == 24) {
        $compress->LastChunk = 1;
    }

    $sbUncompressedChunk->Clear();
    $sbUncompressedChunk->AppendInt($i);
    $sbUncompressedChunk->Append(': This is a line of data to be compressed...\r\n');

    $compress->CompressSb($sbUncompressedChunk,$bdCompressed);

    $compress->FirstChunk = 0;
}

print 'The base64 encoded compressed text:' . "\n";
print $bdCompressed->getEncoded('base64') . "\n";

// Decompress in one call:
$originalText = $compress->decompressStringENC($bdCompressed->getEncoded('base64'));
print $originalText . "\n";

?>