PHP ActiveX

Compress Text Feed to Binary

See more Compression Examples

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

<?php

$success = 0;

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

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

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

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

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

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;
}

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

// Now decompress in one call.  It is important to set both FirstChunk and LastChunk = 1
$bdDecompressed = new COM("Chilkat.BinData");
$compress->FirstChunk = 1;
$compress->LastChunk = 1;
$success = $compress->DecompressBd2($bdCompressed,$bdDecompressed);
if ($success == 0) {
    print $compress->LastErrorText . "\n";
    exit;
}

$originalText = $bdDecompressed->getString('utf-8');
print $originalText . "\n";

?>