Find and Replace using CSV

FindReplace.php

<?php

class FindReplace{
	
	const TOKEN 		= '&&';
	const HYPHEN 		= '-';
	const TARGETDIR		= 'modified';
	const TEMPLATESDIR  = 'templates';
	public $data = array();
	public $filename;
	public $html;
	public $translations;
	public $currentlang;

	public function __construct($file, $csv = null)
	{
		$this->filename = $file;		
		$this->data = self::getCSV($csv);
		if (!empty($this->data)) {
			self::process();
		}
	}

	public function process()
	{
		$langs = static::getLangs();
		foreach ($langs as $l) {
			$this->currentlang = $l;
			self::replace();
		}
	}
	static private function getLangs()
	{
		$result = array ( 
			'en', 
			'ar', 
			'zh-hans' 
		);
		return $result;
	}
	public function getCSV($csv)
	{
		$result = array();		
		$langs = static::getLangs();
		$handle = fopen($csv, "r");
	
		if ($handle) {
			while (($row = fgetcsv($handle,'4069')) !== false) {
				$i = 0;
				foreach ($row as $r=>$column) {
					if ($i === 0) {
						$key = strtolower($column);
					}
					$result[$key][$langs[$i]] = $column;
					$i++;
				}
			}
			if (!feof($handle)) {
				die("Error: unexpected fgets() fail\n");
			}
			fclose($handle);
		}
		//self::pre($result, 'check csv');
		return $result;
	}	
	function findReplacements()
	{
		$result = array();
		$filename = static::TEMPLATESDIR . DIRECTORY_SEPARATOR . $this->filename;
		
		if (file_exists($filename)) {
			$this->html = file_get_contents($filename);
			//replace double quotes with single quotes	
			$this->html = preg_replace("#\"#", "'", $this->html);
			preg_match_all('#\&\&(.*)\&\&#', $this->html,$matches);
			$result = $matches[1];
		} else {
			die ("Error $this->filename does't exist.") ;
		}		
		
		return $result;
	}

	function getReplacements()
	{
		$result = array ();
		$replacements = self::findReplacements();	

		foreach ($replacements as $key) {
			$key = strtolower($key);		
			if (self::isTranslated($key) === true) {
				$result[$key] = $this->data[$key][$this->currentlang];
			}
		}
		
		return $result;
	}
	function replace()
	{
		$to_be_replaced = self::getReplacements();
		foreach ($to_be_replaced as $key=>$translation) {
			$pattern = '#'. static::TOKEN . preg_quote($key). static::TOKEN .'#i';
			$this->html = preg_replace($pattern, $translation, $this->html);
		}
		$file = explode('.',$this->filename);
		$output = static::TARGETDIR . DIRECTORY_SEPARATOR . $this->currentlang . DIRECTORY_SEPARATOR . $file[0];
		$output .= static::HYPHEN . $this->currentlang 	. '.html';
		if (!file_put_contents($output, $this->html)) {
			die('Error occured. ');
		}
	}
	function isTranslated($key) 
	{
		$result = false;
		if (!empty($this->data[$key][$this->currentlang])) {
			$result = true;
		}	
		
		return $result;
	}

}