Compress and decompress swf files using php's zlib_PHP tutorial

The following is an example of compressing and uncompressing swf files I wrote:

// There is no addition to determine whether the swf file has been compressed. If necessary, you can determine whether the first byte of the file is F or C. Determine

Compressed swf file: //File name
$filename = "test.swf";
//Open file
$rs = fopen($filename,"r");
//Read file data
$str = fread($rs,filesize($filename));
//Set swf header file
$head = substr($str,1, 8);
$head = "C".$head;
//Get the swf file content
$body = substr($str,8);
//Compress the file content, use the highest Compression level 9
　$body = gzcompress($body, 9);
　//Merge file header and content
　$str = $head.$body;
　//Close the read file stream
fclose($rs);
//Create a new file
$ws = fopen("create.swf","w");
//Write a file
fwrite( $ws,$str);
　//Close the file and leave it
　fclose($ws);
　//------http://soft.knowsky.com/----- -------------------------------------------------- ---------------------------------------
　?>
　Unzip swf file:
　
　 //--------------------------------------------- -------------------------------------------------- -----------
　//File name
　$filename = "test.swf";
　//Open file
　$rs = fopen($filename,"r ");
　//Read file data
　$str = fread($rs,filesize($filename));
　//Set swf header file
　$head = substr($str ,1,8);
　$head = "F".$head;
　//Get the swf file content
　$body = substr($str,8);
　//Unzip the file Content
　$body = gzuncompress($body);
　//Merge file header and content
　$str = $head.$body;
　//Close the read file stream
　fclose ($rs);
//Create a new file
$ws = fopen("create.swf","w");
//Write a file
fwrite($ws,$ str);
　//Close the file and leave it
　fclose($ws);
　//------------------------- -------------------------------------------------- --------------------------
　?>

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