PHP zip ZipArchive 扩展

<?php
$create_zip = new ZipArchive();
$file_name = "./New.zip";
if ($create_zip->open($file_name, ZipArchive::CREATE)!==TRUE) {
    exit("cannot open the zip file <$file_name>\n");
}
$current_dir=getcwd();
//Create files to add to the zip
$create_zip->addFromString("file1 ". time().".txt" , "#1 This is This is the test file number one.\n"); 
$create_zip->addFromString("file2 ". time().".txt", "#2 This is This is the test file number one.\n");
//add files to the zip
$create_zip->addFile($current_dir . "/too.php","/testfromfile.php");
echo "Number of files added: " . $create_zip->numFiles;
echo "<br>";
echo "Failed to add:" . $create_zip->status ;
$create_zip->close();
?>

<?php
$extract_zip = new ZipArchive;
$open_zip = $extract_zip->open('New.zip');
if ($open_zip === TRUE) {
  $extract_to = getcwd();
    $extract_zip->extractTo($extract_to); //extract to the current working directory.
    echo "Number of Files to be Extracted:" . $extract_zip->numFiles . "<br>";
  $extract_zip->close();
    echo 'Files Successfully Extracted!';
} 
else {
    echo 'Cannot Extract!';
}
?>

<?php
$zip_file = zip_open("New.zip");
if ($zip_file) {
    while ($zip_members = zip_read($zip_file)) {
        echo "Name of the file:               " . zip_entry_name($zip_members) . "<br>";
        echo "Original Size of the File:    " . zip_entry_filesize($zip_members) . "<br>";
        echo "Compressed Size of the File:    " . zip_entry_compressedsize($zip_members) . "<br>";
        echo "Method of Compression: " . zip_entry_compressionmethod($zip_members) . "<br>";
        if (zip_entry_open($zip_file, $zip_members, "r")) {
            echo "Content of the file:<br>";
            $buf = zip_entry_read($zip_members, zip_entry_filesize($zip_members));
            echo "$buf <br>";
            zip_entry_close($zip_members);
        }
        echo "<br>";
    }
    zip_close($zip_file);
}
?>

Name of the file: file1 1644842283.txt
Original Size of the File: 45
Compressed Size of the File: 39
Method of Compression: deflated
Content of the file:
#1 This is test file number one.
Name of the file: file2 1644842283.txt
Original Size of the File: 45
Compressed Size of the File: 39
Method of Compression: deflated
Content of the file:
#2 This is test file number two.

<?php
// Enter the name of directory
$pathdir = "Files to zip/";
//Create a name for the zip folder
$zipcreated = "Files to zip.zip";
// Create new zip class
$zip = new ZipArchive;
if($zip -> open($zipcreated, ZipArchive::CREATE ) === TRUE) {
    // Store the files in our `Files to zip` zip file.
    $dir = opendir($pathdir);
    while($file = readdir($dir)) {
        if(is_file($pathdir.$file)) {
            $zip -> addFile($pathdir.$file, $file);
}
}
}
?>

<?php
// Create new zip class
$zip = new ZipArchive;
// Add zip filename which needs to unzip
$zip->open('Files to zip.zip');
// Extracts to current directory
$zip->extractTo('./Files to zip');
$zip->close();
?>