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(PHP Extension) Compress and Decompress Base64Imagine we have data represented as a base64 string. This example demonstrates how to decode, compress, and re-encode to smaller base64 representing the compressed data. Note: This example requires Chilkat v9.5.0.66 or greater.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $strBase64 = 'VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2cuDQpUaGUgcXVpY2sgYnJvd24gZm94IGp1bXBlZCBvdmVyIHRoZSBsYXp5IGRvZy4NClRoZSBxdWljayBicm93biBmb3gganVtcGVkIG92ZXIgdGhlIGxhenkgZG9nLg0KVGhlIHF1aWNrIGJyb3duIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2cuDQpUaGUgcXVpY2sgYnJvd24gZm94IGp1bXBlZCBvdmVyIHRoZSBsYXp5IGRvZy4NCg0K'; $compress = new CkCompression(); $compress->put_Algorithm('deflate'); $binDat = new CkBinData(); // Load the base64 data into a BinData object. // This decodes the base64. The decoded bytes will be contained in the BinData. $binDat->AppendEncoded($strBase64,'base64'); // Compress the BinData. $compress->CompressBd($binDat); // Get the compressed data in base64 format: $compressedBase64 = $binDat->getEncoded('base64'); print 'compressed base64:' . "\n"; print $compressedBase64 . "\n"; // The compressed base64 is: C8lIVSgszUzOVkgqyi/PU0jLr1DIKs0tSE1RyC9LLVIoAcrnJFZVKqTkp+vxcoUMYeW8XAA= // Now decompress: $binDat->Clear(); $binDat->AppendEncoded($compressedBase64,'base64'); $compress->DecompressBd($binDat); $decompressedBase64 = $binDat->getEncoded('base64'); print 'decompressed base64:' . "\n"; print $decompressedBase64 . "\n"; // The output is the original data: // VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2cuDQpUaGUgcXVpY2sgYnJvd24gZm94IGp1bXBlZCBvdmVyIHRoZSBsYXp5IGRvZy4NClRoZSBxdWljayBicm93biBmb3gganVtcGVkIG92ZXIgdGhlIGxhenkgZG9nLg0KVGhlIHF1aWNrIGJyb3duIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2cuDQpUaGUgcXVpY2sgYnJvd24gZm94IGp1bXBlZCBvdmVyIHRoZSBsYXp5IGRvZy4NCg0K ?> |
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