php的功能(9)

    /* 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;  
    }  
    }  
    /***** Example Usage ***/  
    $files=array('file1.jpg', 'file2.jpg', 'file3.gif');  
    create_zip($files, 'myzipfile.zip', true);  
 
  
 
  
 
　　17. PHP解压缩 Zip 文件 
 
    /**********************