zip库（压缩）

安装

PHP 5.2.0 以及更新版本方式：

• Linux 系统：为了使用这些函数，必须在编译 PHP 时用--enable-zip配置选项来提供 zip 支持。
• Windows：Windows 用户需要在 php.ini 里使 php_zip.dll 可用，以便使用这些函数。

If installing this in a Docker image using:
"docker-php-ext-install zip"
you may get an error such as:
"docker-php-ext-install zip returned a non-zero code: 1"
or
"zip support requires ZLIB"
Docker documentation now suggests this as the proper way to install, to ensure the dependant libraries are installed with it:
# Install zip
RUN apt-get update && \
     apt-get install -y \
     zlib1g-dev && docker-php-ext-install zip

例子

创建一个 Zip 归档

<?php
$zip = new ZipArchive();
$filename = "./test112.zip";
if ($zip->open($filename, ZIPARCHIVE::CREATE)!==TRUE) {
    exit("cannot open \n");
}
$zip->addFromString("testfilephp.txt" . time(), "#1 This is a test string added as testfilephp.txt.\n");
$zip->addFromString("testfilephp2.txt" . time(), "#2 This is a test string added as testfilephp2.txt.\n");
$zip->addFile($thisdir . "/too.php","/testfromfile.php");
echo "numfiles: " . $zip->numFiles . "\n";
echo "status:" . $zip->status . "\n";
$zip->close();
?>

<?php
$zip = zip_open("/tmp/test2.zip");
if ($zip) 
{
    while ($zip_entry = zip_read($zip)) 
    {
        echo "Name:               " . zip_entry_name($zip_entry) . "\n";
        echo "Actual Filesize:    " . zip_entry_filesize($zip_entry) . "\n";
        echo "Compressed Size:    " . zip_entry_compressedsize($zip_entry) . "\n";
        echo "Compression Method: " . zip_entry_compressionmethod($zip_entry) . "\n";
        if (zip_entry_open($zip, $zip_entry, "r")) 
	{
            echo "File Contents:\n";
            $buf = zip_entry_read($zip_entry, zip_entry_filesize($zip_entry));
            echo "$buf\n";
            zip_entry_close($zip_entry);
        }
        echo "\n";
    }
    zip_close($zip);
}
?>