How to insert coordinates of a table into an array in PHP - php

Question

I am making the game battleships in PHP and I need to make it so that the computer randomly chooses 5 coordinates(x, y), and they have to be in a straight line (column or row). How do I make it so the coordinates are in a line and how do I connect the coordinates to the table cells?
Here's what I have so far:
<?php
session_start();
$i=0;
$start=1;
$st=65;
$l=0;
$polje=array();
$x=(mt_rand(0, 10));
$y=(mt_rand(0, 10));
for($q=0; $q<5; $q++){
$polje[$l]=array($x, $y);
}
echo "<table id='table'>\n";
while ($i<11){
$ascii=chr($st);
echo "<tr>";
for($k=0; $k<11; $k++, $start++){
if($k==0){
echo "<td>$i</td>";
}
else if($i==0){
echo "<td class='td2'>$ascii</td>";
$ascii++;
}
else{
echo "<td class='td1'> </td>";
}
}
echo "</tr>";
$i++;
}
?>
This is what the table looks like:

Answer 1

I like this kind of challenge.
Of course, there is a lot of ways, better ways to do this, with OOP, but you can get the point.
Read the comments through the code and if you have any doubts feel free to ask.
I did some treatment to avoid ships overlapping each other, and random deployment.
const BOARD_SIZE = 10; //10x10 board
const SUBMARINE = 1;
const DESTROYER = 2;
const BATTLESHIP = 3;
const AIRCRAFTCARRIER = 4;
$ships_available = [];
//populate with some data based on game rule
array_push($ships_available, SUBMARINE);
array_push($ships_available, SUBMARINE);
array_push($ships_available, DESTROYER);
array_push($ships_available, DESTROYER);
array_push($ships_available, DESTROYER);
array_push($ships_available, BATTLESHIP);
array_push($ships_available, BATTLESHIP);
array_push($ships_available, AIRCRAFTCARRIER);
$board = [];
while(count($ships_available) > 0) {
deployShip($board, $ships_available);
}
$lastColumnLetter = chr(ord('A')+ BOARD_SIZE-1);
//print table
echo "<table border='1' align='center'>";
echo "<tr><td></td><td>".implode('</td><td>',range(1, BOARD_SIZE))."</td></tr>";
for($i = 'A'; $i <= $lastColumnLetter; $i++) {
echo "<tr><td>".$i."</td>";
for($j=0; $j < BOARD_SIZE; $j++) {
echo "<td align='center'>";
echo $board[$i][$j] ?: ' ';
echo "</td>";
}
echo "</tr>";
}
echo "</table>";
exit;
function array_merge_custom($array1, $array2) {
foreach($array2 as $key => $value) {
foreach($value as $k => $v) {
$array1[$key][$k] = $v;
}
}
return $array1;
}
function deployShip(&$board, &$ships_available) {
$randomShipKey = array_rand($ships_available);
$ship = $ships_available[$randomShipKey];
$beginCoordinates = getRandomCoordinates();
$coordinates = getShipCoordinates($board, $beginCoordinates, $ship);
if(!$coordinates) {
return false;
}
unset($ships_available[$randomShipKey]);
$board = array_merge_custom($board,$coordinates);
}
function getRowNumberByLetter($letter) {
return array_search($letter, range('A','Z'));
}
function getRowLetterByNumber($number) {
$letters = range('A','Z');
return $letters[$number];
}
function getRandomCoordinates() {
return ['row' => chr(mt_rand(ord('A'), (ord('A') + BOARD_SIZE-1))), 'col' => mt_rand(0,BOARD_SIZE -1)];
}
function getShipCoordinates($board, $beginCoordinates, $ship) {
if(isset($board[$beginCoordinates['row']][$beginCoordinates['col']])) {
return false; //anchor position already taken
}
if($ship == 1) {
$return[$beginCoordinates['row']][$beginCoordinates['col']] = 1;
return $return;
}
$shipArraySize = $ship -1;
$directions = ['left', 'right', 'up', 'down'];
$tries = 10;
while($tries > 0) {
$tries--;
$direction = $directions[array_rand($directions)];
$return = [];
switch($direction) {
case 'left':
if(($beginCoordinates['col'] - $shipArraySize) < 0) { //check if can go left
break;
}
for($colBegin = ($beginCoordinates['col'] - $shipArraySize), $colEnd = $beginCoordinates['col']; $colBegin <= $colEnd; $colBegin++) {
if(!empty($board[$beginCoordinates['row']][$colBegin])) {
break 2;
} else {
$return[$beginCoordinates['row']][$colBegin] = $ship;
}
}
return $return;
case 'right':
if(($beginCoordinates['col'] + $shipArraySize) > BOARD_SIZE -1) { //check if can go right
break;
}
for($colBegin = $beginCoordinates['col'], $colEnd = ($beginCoordinates['col'] + $shipArraySize); $colBegin <= $colEnd; $colBegin++) {
if(!empty($board[$beginCoordinates['row']][$colEnd])) {
break 2;
} else {
$return[$beginCoordinates['row']][$colBegin] = $ship;
}
}
return $return;
case 'up':
if((getRowNumberByLetter($beginCoordinates['row']) - $shipArraySize) < 0) { //check if can go up
break;
}
for($rowBegin = (getRowNumberByLetter($beginCoordinates['row']) - $shipArraySize), $rowEnd = getRowNumberByLetter($beginCoordinates['row']); $rowBegin <= $rowEnd; $rowBegin++) {
if(!empty($board[getRowLetterByNumber($rowBegin)][$beginCoordinates['col']])) {
break 2;
} else {
$return[getRowLetterByNumber($rowBegin)][$beginCoordinates['col']] = $ship;
}
}
return $return;
case 'down':
if((getRowNumberByLetter($beginCoordinates['row']) + $shipArraySize) > BOARD_SIZE -1) { //check if can go down
break;
}
for($rowBegin = getRowNumberByLetter($beginCoordinates['row']), $rowEnd = (getRowNumberByLetter($beginCoordinates['row']) + $shipArraySize); $rowBegin <= $rowEnd; $rowBegin++) {
if(!empty($board[getRowLetterByNumber($rowBegin)][$beginCoordinates['col']])) {
break 2;
} else {
$return[getRowLetterByNumber($rowBegin)][$beginCoordinates['col']] = $ship;
}
}
return $return;
}
}
return false;
}