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Got trial Rapid PHP 2016 14.0.0.184. Glad to find a beauty replacement for phpDesigner that I am using. But Have Bug: Function Hints shows only one time immediatly after typing function. When I edit-delete parameters or just put cursor in brackets there are no Function Hints displayed.
The hints won't show up when you're just scrolling or clicking around the document. I think in most cases you only need this information when you're writing the function call but I might be wrong.