phpMyAdmin doesn't load database import file with unsupported compression (application/gzip)

i had the same problem under different configuration: Ubuntu 16.04 + PHP 7.0 + VirtualMin. The zip library for php7.0 was simply not installed, so this fixed the problem:

apt-get install php7.0-zip

Edit: this works for php 7.0, the command must suit your php version (7.x)

Put the fix from here http://piwigo.org/forum/viewtopic.php?pid=151458

if (extension_loaded('zlib') && !function_exists('gzopen') && function_exists('gzopen64'))
{
  function gzopen($filename, $mode, $use_include_path = 0) {
    return gzopen64($filename, $mode, $use_include_path);
  }
}

in your /etc/phpmyadmin/config.inc.php. Then it will survive an apt-get upgrade.

Here's an alternative scenario for you.

Downloaded an SQL file from phpmyadmin to local laptop. Before uploading to new server , I compressed locally form within finder. ( this is the mistake ) as this adds __MACOS folder to the compressed file. myfile.sql.zip

Generates the same error message.

phpMyAdmin doesn't load database import file with unsupported compression (application/gzip)

To stop that from happening, just gzip the file from the command line so you have..

gzip myfile.sql

myfile.sql.gz

and upload that.