php - Laravel method chaining a query through a function -

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Is it possible to chain methods as conditional in PHP / Laravel, or passed to the method chain through function for?

I want to control a query in Laravel's query builder by setting a base query first, then sending it to a function to keep the other methods chained. As a quick example: 

  $ query = model: whereFoo ('bar'); If ($ needFoo) {$ query = $ query- & gt; Is ('foo'); } $ Query = queryMethod ($ query); Function query method ($ query) {return $ query- & gt; Where ('some', '<', 10); } $ Items = $ query- & gt; get receive ();  $ query = Model: whereFoo ('bar');  and  $ items = $ query- & gt; Seems to ignore everything between   
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 What a difference does not make that  $ query .  
 Is it possible to get advice / advice?  
  Edit:  I have accepted the answer given below because it answers the questions I have asked my problem was actually unrelated if it helps someone : I was called in a rogue  or where ()  base query, which, along with mandatory results, regardless of other chain methods. It is necessary that nesting is needed in a modern way.   
 
 
 What you should do, but you can simplify it:  
 < Code> $ query = Model :: whereFoo ('bar'); If ($ surefu) $ query- & gt; Is ('foo'); QueryMethod ($ query); Function Query Method ($ query) {$ query- & gt; Where ('some', '<', 10); } $ Items = $ query- & gt; get receive ();   
 Since the object in PHP is passed from context, you will always behave with that same example.

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