(PHP ActiveX) Compress Text Feed to Binary

This example receives incoming text data in chunks, compresses as a stream, and accumulates the compressed binary data.

The purpose is to demonstrate the BeginCompressString, MoreCompressString, and EndCompressString methods.

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

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

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData')
$compressedData = new COM("Chilkat.BinData");

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Compression')
$compress = new COM("Chilkat.Compression");
$compress->Algorithm = 'deflate';
$compress->Charset = 'utf-8';

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringBuilder')
$sbIndex = new COM("Chilkat.StringBuilder");

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) {
        $compressedBytes = $compress->BeginCompressString($sbIndex->getAsString());
    }
    else {
        $compressedBytes = $compress->MoreCompressString($sbIndex->getAsString());
    }

    $compressedData->AppendBinary($compressedBytes);
    $compressedBytes = $compress->MoreCompressString(': This is a line of data to be compressed...\r\n');
    $compressedData->AppendBinary($compressedBytes);
}

// Flush any remaining output.
$compressedBytes = $compress->EndCompressString();
$compressedData->AppendBinary($compressedBytes);

// Show the compressed data in hex format:
print 'The hex encoded compressed text:' . "\n";
print $compressedData->getEncoded('hex') . "\n";

// Now decompress in one call:
$compressedBytes = $compressedData->GetBinary();
$originalText = $compress->decompressString($compressedBytes);
print $originalText . "\n";

?>