php 创建zip文件的实例代码 压缩文件的方法

php 创建压缩文件的方法实例如下：

<?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 ***/ 
	$files=array('file.csv', 'index.php'); 
	create_zip($files, 'myzipfile.zip'); 
?>

create_zip($files, 'myzipfile.zip'); 创建压缩文件函数参数说明
第一个参数是要压缩的文件数组，第二个参数是，压缩文件的路径和文件名