php - ZipArchive::getStatusString(): Invalid or uninitialized Zip object -

the following code fail create zip file in php 5.6.12 , fail print out zip error message, instead displaying error / warning

warning: ziparchive::getstatusstring(): invalid or uninitialized zip object in /tmp/x.php on line 9 

but why? once worked in php 5.4.

<?php  // todo: check errors $temppath = tempnam('/tmp', 'ztmp');  $zip = new ziparchive(); $res = $zip->open($temppath, ziparchive::overwrite | ziparchive::create | ziparchive::excl);  if ( $res !== true )     die($zip->getstatusstring()."\n"); 

it looks semantics have changed somewhat; unclear whether deliberate or bug.

anyways, problem have empty file not valid zip being opened nonetheless , not initialized though requested file overwritten.

so workaround or fix delete existing file , recreate it:

<?php  $temppath = tempnam('/tmp', 'ztmp');  // delete first @unlink($temppath);  $zip = new ziparchive(); $res = $zip->open($temppath, ziparchive::overwrite | ziparchive::create | ziparchive::excl);  if ( $res !== true )     die($zip->getstatusstring()."\n");