conditional php inside haml class name -

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I am trying to keep a conditional statement in the name of the square for the name. I can do the regular html 

  & lt; A href = "/" class = linkHeader & lt; Php if ($ self) {echo 'active'; }? & Gt; & Lt; / A & gt;   
 How do I do this in haml?  
 % a {: class => "LinkHeader",: href = & gt; "/"}    
 
 
 What are you using? MtHaml? Old (and broken) phapap?  
 I'm using it on MtHaml:  
 % a.linkHeader {class: $ self? 'Active': ''}

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