For PHP developers, Psalm is a must-use tool!

A screenshot of a PHP code editor with syntax highlighting, showing a foreach loop iterating over an array of documents. A tooltip popup appears over the variable $updatedDocs, displaying its type as 'list{non-falsy-string|null, ...<non-falsy-string|null>}' and offering to 'Click to show 2 definitions.' The code uses PHP's short array syntax and type hints.

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