wp-cli / php-cli-tools

A collection of tools to help with PHP command line utilities
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PHP 8.1: fix "passing null to non-nullable" #174

Closed jrfnl closed 2 months ago

jrfnl commented 2 months ago

As of PHP 8.1, passing null to not explicitly nullable scalar parameters for PHP native functions is deprecated.

In this case, the Test_Table_Ascii::testSpacingInTable() method passes a row with the following values: array('A2', '', ' C2', null). This then hits this deprecation in the cli\table\Ascii::row() method when calling the PHP native str_replace() function on line 141.

This can be seen when running the unit tests with --display-deprecations:

1) path/to/php-cli-tools/lib/cli/table/Ascii.php:141
str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated

Triggered by:

* Test_Table_Ascii::testSpacingInTable
  path/to/php-cli-tools/tests/Test_Table_Ascii.php:120

There are two options here:

  1. Fix the test to pass an empty string instead of null for the fourth cell.
  2. Fix the method under test to handle potential null values more elegantly.

I'm not sure what the desired solution is in this case, so I've implemented solution 2 to maintain the existing behaviour, but can change this to solution 1 if so desired.

Refs: