Fatal error: Class 'ZipArchive' not found (PHP 5.3.1) - php

Question

When the function below is run, I'm getting...Fatal error: Class 'ZipArchive' not found in /home/test/dummyurl.com/wp-content/themes/mytheme/upload-zip.php on line 14
PHP Version is 5.3.1
function openZip($file_to_open) {
global $target;
$zip = new ZipArchive(); //This is line 14
$x = $zip->open($file_to_open);
if($x === true) {
$zip->extractTo($target);
$zip->close();
unlink($file_to_open);
} else {
die("There was a problem. Please try again!");
}
}
This is in a wordpress application, and I think I might perhaps be able to use a built-in function (see below) instead, but still not sure why ZipArchive class is missing above...
/**
* Unzip's a specified ZIP file to a location on the Filesystem via the WordPress Filesystem Abstraction.
* Assumes that WP_Filesystem() has already been called and set up. Does not extract a root-level __MACOSX directory, if present.
*
* Attempts to increase the PHP Memory limit to 256M before uncompressing,
* However, The most memory required shouldn't be much larger than the Archive itself.
*
* #since 2.5.0
*
* #param string $file Full path and filename of zip archive
* #param string $to Full path on the filesystem to extract archive to
* #return mixed WP_Error on failure, True on success
*/
function unzip_file($file, $to) {
global $wp_filesystem;
if ( ! $wp_filesystem || !is_object($wp_filesystem) )
return new WP_Error('fs_unavailable', __('Could not access filesystem.'));
// Unzip can use a lot of memory, but not this much hopefully
#ini_set('memory_limit', '256M');
$needed_dirs = array();
$to = trailingslashit($to);
// Determine any parent dir's needed (of the upgrade directory)
if ( ! $wp_filesystem->is_dir($to) ) { //Only do parents if no children exist
$path = preg_split('![/\\\]!', untrailingslashit($to));
for ( $i = count($path); $i >= 0; $i-- ) {
if ( empty($path[$i]) )
continue;
$dir = implode('/', array_slice($path, 0, $i+1) );
if ( preg_match('!^[a-z]:$!i', $dir) ) // Skip it if it looks like a Windows Drive letter.
continue;
if ( ! $wp_filesystem->is_dir($dir) )
$needed_dirs[] = $dir;
else
break; // A folder exists, therefor, we dont need the check the levels below this
}
}
if ( class_exists('ZipArchive') && apply_filters('unzip_file_use_ziparchive', true ) ) {
$result = _unzip_file_ziparchive($file, $to, $needed_dirs);
if ( true === $result ) {
return $result;
} elseif ( is_wp_error($result) ) {
if ( 'incompatible_archive' != $result->get_error_code() )
return $result;
}
}
// Fall through to PclZip if ZipArchive is not available, or encountered an error opening the file.
return _unzip_file_pclzip($file, $to, $needed_dirs);
}

Answer 1

To enable ZipArchive, you need to compile PHP with the --enable-zip option, as stated in the documentation.
Alternatively, you could install the zip PECL package.

Answer 2

You have to enable the php extention
1) php_zip
2) php_zlib_filters