(PECL pdflib >= 2.0.0)
  	
    
      
      Define relationships among layers
    
    
      
      bool PDF_set_layer_dependency ( resource $pdfdoc, string $type, string $optlist )
    
    
    
     Defines hierarchical and group relationships among layers. Returns TRUE on success or FALSE on failure. 
This function requires PDF 1.5.
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