Online PHP editor | output for Re39j

<?php class MineSweeper{ private $data = NULL; private $map; function debug(){ header('Content-Type:text/plain'); } function createMap($data){ $this->data = $data; if(!preg_match('/^[\*\.\r\n]+$/', $this->data)){ throw new Exception('Invalid input provided. Only asterik (*) and/or dot (.) is allowed.'); } // breaking input to lines $lines = preg_split('/\r\n/', $this->data); $tmp_line = NULL; // holding previous line for comparsion // lines index foreach ($lines as $lnum=>$line){ // lines should be equal in length if ($tmp_line != NULL && strlen($tmp_line) != strlen($line) ){ throw new Exception('Invalid input provided, please correct the format. Not all rows are equal.'); }else { $tmp_line = $line; // removing back spac and line break and spliting into charatcers (means multi dimension array) $lines[$lnum] = str_split(str_replace('\r\n','', $line)); } } // N= lines // M = Characters $M = count($lines[0]); $this->map = new MineMap($lines); } function display(){ $this->map->display(); } } class MineMap{ private $lines = array(); private $N; private $M; function __construct($lines){ $this->lines = $lines; $this->N = count($lines); $this->M = count($lines[0]); foreach($this->lines as $lnum => $line){ $this->lines[$lnum] = array_map(function($str){ return (trim($str) == "*") ? trim($str) : 0; }, $line); } foreach($this->lines as $lnum => $line){ foreach($line as $index => $str){ if ($str === "*"){ $this->mineFound($lnum, $index); } } } } function incValue($n, $m){ if ($m < $this->M && $n < $this->N && $n >= 0 && $m >= 0){ $this->lines[$n][$m]++; } } function mineFound($n, $m){ $this->incValue($n, $m+1); $this->incValue($n, $m-1); $this->incValue($n+1, $m-1); $this->incValue($n+1, $m); $this->incValue($n+1, $m+1); $this->incValue($n-1, $m-1); $this->incValue($n-1, $m); $this->incValue($n-1, $m+1); } function display(){ echo "<table cellspacin='5px'>"; foreach ($this->lines as $line){ echo "<tr>"; foreach($line as $str){ echo "<td style=''><button data='$str' class='btn btn-primary'>   </td>"; } echo "</tr>"; } echo "</table>"; } }