Open a ZIP file archive

# ZipArchive::open

(PHP 5 >= 5.2.0, PHP 7, PHP 8, PECL zip >= 1.1.0)

ZipArchive::open — Open a ZIP file archive

### Description

public ZipArchive::open(string `$filename`, int `$flags` = 0): bool|int

Opens a new or existing zip archive for reading, writing or modifying.

Since libzip 1.6.0, an empty file is not a valid archive any longer.

### Parameters

`filename`

  The file name of the ZIP archive to open.

`flags`

  The mode to use to open the archive.

  - `ZipArchive::OVERWRITE`

  - `ZipArchive::CREATE`

  - `ZipArchive::RDONLY`

  - `ZipArchive::EXCL`

  - `ZipArchive::CHECKCONS`

### Return Values

Returns `true` on success, `false` or one of the following error codes on error:

`ZipArchive::ER_EXISTS`
  File already exists.
`ZipArchive::ER_INCONS`
  Zip archive inconsistent.
`ZipArchive::ER_INVAL`
  Invalid argument.
`ZipArchive::ER_MEMORY`
  Malloc failure.
`ZipArchive::ER_NOENT`
  No such file.
`ZipArchive::ER_NOZIP`
  Not a zip archive.
`ZipArchive::ER_OPEN`
  Can't open file.
`ZipArchive::ER_READ`
  Read error.
`ZipArchive::ER_SEEK`
  Seek error.

### Examples

Example #1 Open and extract

`<?php
$zip = new ZipArchive;
$res = $zip->open('test.zip');
if ($res === TRUE) {
echo 'ok';
$zip->extractTo('test');
$zip->close();
} else {
echo 'failed, code:' . $res;
}
?>`

Example #2 Create an archive

`<?php
$zip = new ZipArchive;
$res = $zip->open('test.zip', ZipArchive::CREATE);
if ($res === TRUE) {
$zip->addFromString('test.txt', 'file content goes here');
$zip->addFile('data.txt', 'entryname.txt');
$zip->close();
echo 'ok';
} else {
echo 'failed';
}
?>`

Example #3 Create an temporary archive

`<?php
$name = tempnam(sys_get_temp_dir(), "FOO");
$zip = new ZipArchive;
$res = $zip->open($name, ZipArchive::OVERWRITE); /* truncate as empty file is not valid */
if ($res === TRUE) {
$zip->addFile('data.txt', 'entryname.txt');
$zip->close();
echo 'ok';
} else {
echo 'failed';
}
?>`
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