<?php

class Getxmlbigdata {
	public static function build() {
        return new Getxmlbigdata;
    }
	
	function nodeStringFromXMLFile($handle, $startNode, $endNode, $callback=null) {
		$cursorPos = 0;
		while(true) {
			$startPos = $this->getPos($handle, $startNode, $cursorPos);
			if($startPos === false) { 
				break;
			}
			$endPos = $this->getPos($handle, $endNode, $startPos) + mb_strlen($endNode);
			fseek($handle, $startPos);
			$data = fread($handle, ($endPos-$startPos));
			$callback($data);
			$cursorPos = ftell($handle);
		}
	}

	function getPos($handle, $string, $startFrom=0, $chunk=1024) {
		fseek($handle, $startFrom, SEEK_SET);
		$data = fread($handle, $chunk);
		$stringPos = mb_strpos($data, $string);
		if($stringPos !== false ) {
			return $stringPos+$startFrom;   
		}
		if(feof($handle)) {
			return false;
		}
		return $this->getPos($handle, $string, $chunk+$startFrom);
	}

	function getArrayFromXMLString($nodeAsString, $explode) {
		$arrData = array();
		$el1 = explode("<".$explode.">", $nodeAsString);
		unset($el1[0]);
			  
		preg_match_all("/<\/(.*?)>/si", $el1[1], $arrLabel);
		$arrLabel = $arrLabel[1];
				  
		foreach($el1 as $key => $val) {
			$el2 = explode("</".$explode.">", $val);
			foreach($arrLabel as $kL => $vL) {
				$value = $this->get_data($vL, $el2[0]);
				if(!empty($value)) {
					preg_match("/^<!\[CDATA\[(.*)\]\]>$/s", $value[1], $dataValue);
					$arrData[$key][$vL] = !empty($dataValue[1]) ? strip_tags($dataValue[1]) : strip_tags($value[1]);
				}
			}
		}
					
		return $arrData;
	}
	
	function get_data( $tag , $content )
	{
		preg_match("/<".$tag."[^>]*>(.*?)<\/$tag>/si", $content, $matches);
		return $matches;
	}
}