$ php drush.php st
count(): Parameter must be an array or an object that implements Countable   [warning]
Table.php:789
count(): Parameter must be an array or an object that implements Countable   [warning]
Table.php:789
count(): Parameter must be an array or an object that implements Countable   [warning]
Table.php:789
count(): Parameter must be an array or an object that implements Countable   [warning]
Table.php:789
count(): Parameter must be an array or an object that implements Countable   [warning]
Table.php:789
count(): Parameter must be an array or an object that implements Countable   [warning]
Table.php:789
count(): Parameter must be an array or an object that implements Countable   [warning]
Table.php:789
 PHP configuration      :  /etc/php/7.2/cli/php.ini 
 PHP OS                 :  Linux                    
 Drush script           :  /var/www/drush/drush.php 
 Drush version          :  8.1.16-dev               
 Drush temp directory   :  /tmp                     
 Drush configuration    :                           
 Drush alias files      :                             
pear/Console_Table#14
          
It is a general PHP 7.2 issue. count() function should not be used to count uncountable values anymore.

http://php.net/manual/en/migration72.incompatible.php#migration72.incompatible.warn-on-non-countable-types.
This particular warning comes from Pear Console Table package. I referenced related issue in the ticket description. That package does not seem actively maintained. Given it is just a single class, we could simply copy it to Drush 8 codebase.
          
A backtrace says the call is in includes/output.inc:303, and it doesn't look like we can fix/workaround this from Drush's side.
function _updateRowsCols($rowdata = null) {
   // ...
  $this->_max_cols = max($this->_max_cols, count($rowdata));
  // ...
Console_Table class is doing it wrong because it relies on the count() to function as an !empty() as well.

My 👍 to copy, fix, and keep the class ourselves. It's not like we can make significant changes (for example use a better library) at this 8.x age.
Alternately we could @silent() the parent caller. Feels dirty either way.
On Mar 9, 2018 23:16, "Greg Anderson" ***@***.***> wrote:
 Is this fixed in pear/console_table 1.3.1 / Drush 8.1.16? Not sure what
 the resolution was, but that seemed to be my conclusion during light
 testing yesterday. Didn't see the message when running 8.1.16.
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Using pear install Console_Table I was also updated to 1.3.1 but I unfortunately am still flooded with count() warnings.  When installing drush 8 dev, I get version 8.0.2; where when installing drush 8 I get version 8.0.0.  I think something is confused.  Regardless, upgrading to drush 9 resolved all of the issues.
          
I think the PHP requirements in the documentation are not correct. Old Drush version are likely not compatible with PHP 7.2+.

https://docs.drush.org/en/master/install/#drupal-compatibility
      
Use Console_Table 1.3.1 instead of Console_Table 1.1.5 that comes by default with drush 6.7.0 version.
At https://github.com/drush-ops/drush/blob/6.x/includes/environment.inc Console_Table 1.1.5 is downloaded dynamically if it does not already exist in lib folder. So we download 1.3.1 first and rename it to 1.1.5 as a "trick" to make it work without any other change
Error sighted. If drush is globally installed this can be fixed via:

composer global require pear/console_table
That solved it! Thanks
          
For Drush 7 users. I've added this requirement in my project composer.json, cc @darkdiesel:
"pear/console_table": "v1.3.1 as v1.2.99"
For Drush 7 users. I've added this requirement in my project composer.json, cc @darkdiesel:
"pear/console_table": "v1.3.1 as v1.2.99"
For Drush 7, installed globally I added this in the ~/.composer/composer.json file, and then I runned 'composer update'