code: function MsPowerpoint_SearchInSlides($str, $returnFirstFound = true) {
  
  		// init the list of slides
  		$this->MsPowerpoint_InitSlideLst(); // List of slides
  
  		// build the list of files in the expected structure
  		$files = array();
  		foreach($this->OpenXmlSlideLst as $i=>$s) $files[$i+1] = $s['idx'];
  
  		// search
  		$find = $this->TbsSearchInFiles($files, $str, $returnFirstFound);
  
  		return $find;
  
  	}
docs: Search a string in all slides of the Presentation.