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WordPress/wp-includes
hellofromTonya 1c8de0817f Code Modernization: Fix null to non-nullable deprecations in WP_Meta_Query::get_sql_for_clause().
In the `WP_Meta_Query::get_sql_for_clause()`, the `'value'` index from a meta query array is passed to the PHP native `trim()` function without prior validation.

In PHP 8.1, this could lead to a `trim(): Passing null to parameter #1 ($string) of type string is deprecated` notice.

`trim()` expects a text string and is only useful when ''passed'' a text string as no other variable type can contain whitespace.

Fixed now by verifying that the ''value'' is a string before processing it with `trim()`.

This issue is already covered by the existing `Tests_Meta_Query::test_null_value_sql()` and the `Tests_Meta_Query::test_convert_null_value_to_empty_string()` tests.

Follow-up to [17699], [29887], [29940].

Props jrf, hellofromTonya.
See #53635.
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