Description:
------------
the PHP function ZipArchive::open() use 'filename_len' from parmeter as ze_obj->filename's length( ze_obj->filename_len ),called the function expand_filepath the resolved_path's length may less than filename's length。Although there was not where to use ze_obj->filename_len at present, i think it was a security risk, maybe someday.
=============================================
	if (!expand_filepath(filename, resolved_path TSRMLS_CC)) {
		RETURN_FALSE;
	}

	if (ze_obj->za) {
		/* we already have an opened zip, free it */
		if (zip_close(ze_obj->za) != 0) {
			_zip_free(ze_obj->za);
		}
		ze_obj->za = NULL;
	}
	if (ze_obj->filename) {
		efree(ze_obj->filename);
		ze_obj->filename = NULL;
	}

	intern = zip_open(resolved_path, flags, &err);
	if (!intern || err) {
		RETURN_LONG((long)err);
	}
	ze_obj->filename = estrdup(resolved_path); // here is use resolved_path as filename
	ze_obj->filename_len = filename_len;    // but here is use len from args
	ze_obj->za = intern;
	RETURN_TRUE;


Test script:
---------------
<?php
$zip = new ZipArchive;
$fn = "/../../../../root/test.zip";
#var_dump( $fn );
$res = $zip->open($fn);
if ($res === TRUE) {
    echo 'ok';
    $zip->extractTo('test');
    $zip->close();
} else {
    echo 'failed, code:' . $res;
}
?>