Compress Text, Convert it to Base64 and Back – PHP Functions

How to compress and decompress text an encode/decode using base64 functions:

1. Compress and Encode to Base64

function Compress2Base64($str, $gztype='deflate') {	
  switch($gztype) {
    case 'deflate' : return base64_encode( gzdeflate($str, 9) );		
    case 'compress' : return base64_encode( gzcompress($str, 9) );
    case 'encode' : return base64_encode( gzencode($str, 9) );
    default: return base64_encode( gzdeflate($str, 9) );
  }
}

2. Decode from Base64 and decompress string/text

function deCompressBase64($str, $gztype='deflate') {	
  switch($gztype) {
    case 'deflate' : return @gzinflate(base64_decode($str));		
    case 'compress' : return @gzuncompress(base64_decode($str));	
    case 'encode' : return @gzdecode(base64_decode($str));	
    default: return @gzinflate(base64_decode($str));	
  }
}

where $gztype can take this values:

  • deflate,
  • compress
  • encode

but as an idea, deflate is best for size;

Note: To decode you must use the same value for $gztype.

More compact variants for the above functions:

1. Compress and Encode to Base64

function Compress2Base64($str, $gztype=ZLIB_ENCODING_RAW ) {	
	return base64_encode( zlib_encode($str, $gztype, 9) );
}

2. Decode from Base64 and decompress string/text

function deCompressBase64($str, $gztype='deflate') {	
	return @zlib_decode(base64_decode($str));
}

where $gztype can take this values:

  • ZLIB_ENCODING_RAW
  • ZLIB_ENCODING_DEFLATE
  • ZLIB_ENCODING_GZIP

ZLIB_ENCODING_RAW is better (shorter result)

byrev Written by:

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