php ZipArchive压缩函数详解实例

用ZipArchive压缩文件，这个是php的扩展类，自php5.2版本以后就已经支持这个扩展，如果你在使用的时候出现错误，查看下php.ini里面的extension=php_zip.dll前面的分号有没有去掉，然后再重启Apache这样才能使用这个类库。
例1、生成zip 压缩文件
代码如下:
<?php
/* 生成zip 压缩文件 */
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) {
            $file_info_arr= pathinfo($file);
            $zip->addFile($file,$file_info_arr['basename']);//去掉层级目录
        }
        //debug
        //echo 'The zip archive contains ',$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;
    }
}

define('ROOTPATH',dirname ( __FILE__ )); //网站路径