<?php
	class FileManger {
		private static $instance = 0;
		private $mainFile;
		private $contents;
		private $fileName;
		private $filePath;
		public $outputFileName;
		private $chunkSize = 2000;
		protected function __construct($fileName, $filePath, $chunkSize) {
			$this->fileName = $fileName;
			$this->filePath = $filePath;
			$this->chunkSize = $chunkSize;
		}
		
		public static function getInstance($fileName, $filePath, $chunkSize) {
			if(self::$instance == 0) {
			 self::$instance = new self($fileName, $filePath, $chunkSize);
			}
			return self::$instance;			
		}
		public function splitFile() {
			if ($this->fileName == '') {
				return 'File name empty';
			}
			if($this->filePath == '') {
				return 'File Path empty';
			}
			if($this->chunkSize == 0 ) {
				return 'Chunk size empty';
			}
			if(file_exists($this->filePath . 'files')) {
				rmdir($this->filePath . 'files');
			}
			mkdir($this->filePath . 'files',0777);
			$this->mainFile = $this->filePath . $this->fileName;
			
			$mainFileHandle = fopen($this->mainFile,'rb');
			if($mainFileHandle === false) {
				return 'Unable to open file';
			}
			while(!feof($mainFileHandle)) {
				$this->contents = fread($mainFileHandle,$this->chunkSize);
				$newFileName = $this->filePath . 'files/' . substr($this->fileName,0,strlen($this->fileName) - 4) . sprintf('%03d',$i++) . substr($this->fileName, -4);
				$chunkFileHandle = fopen($newFileName,'wb');
				fwrite($chunkFileHandle, $this->contents);
				fclose($chunkFileHandle);
			}
			return "Success";
		}
		public function joinFile() {
			$dirHandle = dir($this->filePath . 'files/');
			$fileArray = Array();
			while(false !== ($file = $dirHandle->read()) ){
				if($file != '.' && $file != '..'){
					$fileArray[] = $file;
				}
			}
			if(!is_array($fileArray) && count($fileArray) < 1) {
				return 'No Files';			
			}
			$newFileHandle = fopen($this->filePath . $this->outputFileName, 'ab');
			for($i = 0; $i < count($fileArray); $i++) {
				//$this->chunkFileHandle = fopen($this->filePath . 'files/' . $fileArray[$i], 'r');
				$this->contents = file_get_contents($this->filePath . 'files/' . $fileArray[$i]);
				fwrite($newFileHandle, $this->contents);
				unlink($this->filePath . 'files/' . $fileArray[$i]);
			}
			fclose($newFileHandle);
			
		}
		
	}
	$filePath = dirname(__FILE__)."/";
	$fileName = "1st.jpg";
	$chunkSize = '20000';
	$fileManger = FileManger::getInstance($fileName, $filePath, $chunkSize);
	$fileManger->outputFileName = "newImage.jpg";
	//$fileManger->splitFile();
	//$fileManger->joinFile();
?>