function pptx_to_text($input_file){
$zip_handle = new ZipArchive;
$output_text = "";
if(true === $zip_handle->open($input_file)){
$slide_number = 1; //loop through slide files
while(($xml_index = $zip_handle->locateName("ppt/slides /slide".$slide_number.".xml")) !== false){
$xml_datas = $zip_handle->getFromIndex($xml_index);
$xml_handle = DOMDocument::loadXML($xml_datas, LIBXML_NOENT | LIBXML_XINCLUDE | LIBXML_NOERROR | LIBXML_NOWARNING);
$output_text .= strip_tags($xml_handle->saveXML());
$slide_number++;
}
if($slide_number == 1){
$output_text .="";
}
$zip_handle->close();
}else{
$output_text .="";
}
return $output_text;
}
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