This PR was merged into the 3.2-dev branch.Discussion----------[Console] Fix empty COLUMNS/LINES env vars| Q             | A| ------------- | ---| Branch?       | 3.2| Bug fix?      | yes| New feature?  | no| BC breaks?    | no| Deprecations? | no| Tests pass?   | yes| Fixed tickets | -| License       | MIT| Doc PR        | -Here is a python app that fails otherwise:test.py:```pythonimport osint(os.environ.get('COLUMNS', 80))```test.php:```php<?phpputenv('COLUMNS=');passthru('python test.py');```result:```$ php test.phpTraceback (most recent call last): File "test.py", line 3, in <module>   int(os.environ.get('COLUMNS', 80))ValueError: invalid literal for int() with base 10: ''```Commits-------8ad991e [Console] Fix empty COLUMNS/LINES env vars

…ded) (duncan3dc)This PR was merged into the 3.2 branch.Discussion----------[Console] Allow terminal dimensions to be set to 0 (unbounded)| Q             | A| ------------- | ---| Branch?       | 3.2| Bug fix?      | yes| New feature?  | no| BC breaks?    | no| Deprecations? | no| Tests pass?   | yes| Fixed tickets |#21513| License       | MITA previous PR (#20328) changed the behavior of terminals with undefined widths from unbounded to 80 characters. And due to the way the existing code worked it become impossible to set a terminal to be unbounded again. This PR provides a way to restore the previous behavior:```phpputenv('COLUMNS=0');```Commits-------4c1b001 Allow terminal dimensions to be set to 0 (unbounded)