php speed testing of conditionals -

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Assume that there is already a statement on the page.

Now, out of: 

  If another makes a statement and if   
 who is the fastest and slowest?  
 Does this make any difference $ $ takes only 2 potential values?  
  Edit: Sample code:   
  $ a = 2; If ($ a == 1) {...}   
 THEN  
  if ($ a == 2) {...}   
 OR  
  other {...}   
 OR  
  else if ($ A == 2) {...}    
 
 
 While I crave For the momentum, I think that measuring the benchmark of PHP conditionals would be something that would not be decisive due to many different variables affecting your output.  
 With this, the benchmark shows between the if / elseif / else statement as opposed to the switch / case statement.  
 Hope you will be able to feed your Uber, Enterprise level desires!

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