<?php
/**
 * Copyright Nicholas Jordon - All Rights Reserved
 * License: GNU LGPL v3 or later
 * License URL: http://www.gnu.org/licenses/lgpl-3.0.html
 */
class bitwise {
		private $xchng = array(
				'bit' => array(
						'0000',  '0001',
						'0010',  '0011',
						'0100',  '0101',
						'0110',  '0111',
						'1000',  '1001',
						'1010',  '1011',
						'1100',  '1101',
						'1110',  '1111'
				),
				'val' => array(
						'0000' =>  '0',  '0001' =>  '1',
						'0010' =>  '2',  '0011' =>  '3',
						'0100' =>  '4',  '0101' =>  '5',
						'0110' =>  '6',  '0111' =>  '7',
						'1000' =>  '8',  '1001' =>  '9',
						'1010' => '10',  '1011' => '11',
						'1100' => '12',  '1101' => '13',
						'1110' => '14',  '1111' => '15'
				)
		);

		public function create_bit_str($int_input){
				$xchng = $this->xchng['bit'];
				// convert value to bits
				$vals = str_split((string) $int_input,2); // cast (str) incase they do (int)
				$values = '';
				foreach ($vals as $val) {
						$val = (int) $val;
						if(isset($xchng[$val])){
								$values .= $xchng[$val];
						}else{
								return FALSE;
						}
				}
				return $values;
		}

		public function create_val_str($str_input){
				$xchng = $this->xchng['val'];
				// convert bits to value
				$bits = str_split((string) $str_input,4); // cast (str) incase they do (int)
				$r_str = '';
				foreach ($bits as $bit) {
						$bit = $bit;
						if(isset($xchng[$bit])){
								$r_str .= $xchng[$bit];
						}else{
								return FALSE;
						}
				}
				return $r_str;
		}
}


// testing script
$bit = new bitwise;

$range = range(0,15);
foreach ($range as $num) {
	foreach ($range as $cnum) {
		$org = $bit->create_bit_str($num & $cnum);
		$r1  = $bit->create_bit_str($num);
		$r2  = $bit->create_bit_str($cnum);
		echo ((string) $num).' & '.$cnum.' or '.var_export($r1,1).' & '.var_export($r2,1).' = '.var_export($org,1).' or '.var_export($bit->create_val_str($org),1).PHP_EOL;
		$org = $bit->create_bit_str($num | $cnum);
		echo ((string) $num).' | '.$cnum.' or '.var_export($r1,1).' | '.var_export($r2,1).' = '.var_export($org,1).' or '.var_export($bit->create_val_str($org),1).PHP_EOL;
		$org = $bit->create_bit_str($num ^ $cnum);
		echo ((string) $num).' ^ '.$cnum.' or '.var_export($r1,1).' ^ '.var_export($r2,1).' = '.var_export($org,1).' or '.var_export($bit->create_val_str($org),1).PHP_EOL.PHP_EOL;
	}
}