<?php
/* 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);
?>

[scode type="green"]PHP解压缩 Zip文件[/scode]

<?php
/**
 * @param $file - path to zip file
 * @parm $destination - destination directory for unzipped files
 */
function unzip_file($file, $destination) {
    // create object
    $zip = new ZipArchive() ;
    // open archive
    if ($zip->open($file) !== TRUE) {
        die ('Could not open archive');
    }
    // extract contents to destination directory
    $zip->extractTo($destination);
    // close archive
    $zip->close();
    echo 'Archive extracted to directory';
}
?>