php简单创建zip压缩文件的方法

/* creates a compressed zip file */function create_zip($files = array(),$destination = '',$overwrite = false) {  //if the zip file already exists and overwrite is false, return false  if(file_exists($destination) && !$overwrite) { return false; }  //vars  $valid_files = array();  //if files were passed in...  if(is_array($files)) {    //cycle through each file    foreach($files as $file) {      //make sure the file exists      if(file_exists($file)) {        $valid_files[] = $file;      }    }  }  //if we have good files...  if(count($valid_files)) {    //create the archive    $zip = new ZipArchive();    if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {      return false;    }    //add the files    foreach($valid_files as $file) {      $zip->addFile($file,$file);    }    //debug    //echo 'The zip archive contains ',$zip->numFiles,' files with a status of ',$zip->status;    //close the zip -- done!    $zip->close();    //check to make sure the file exists    return file_exists($destination);  }  else  {    return false;  }}

$files_to_zip = array(  'preload-images/1.jpg',  'preload-images/2.jpg',  'preload-images/5.jpg',  'kwicks/ringo.gif',  'rod.jpg',  'reddit.gif');//if true, good; if false, zip creation failed$result = create_zip($files_to_zip,'my-archive.zip');