PHP Syntax error on empty line: syntax error, unexpected '}' [closed] - php

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Parse error: syntax error, unexpected '}', expecting end of file
it occurs is on an empty line between my removeWalls function and the setup comment but I am positive that there are no missing semicolons or unclosed brackets. Does anyone know why this is happening and how to fix it?
$cols;
$rows;
$w = 20;
$grid = new jsarray();
$current;
$stack = new jsarray();
$height = 600;
$width = 600;
$cols = floor($width/$w);
$rows = floor($height/$w);
function index($i, $j) {
if ($i < 0 || $j < 0 || $i > $cols - 1 || $j > $rows - 1) {
return -1;
}
return $i + $j * $cols;
}
// Classes
class Cell{
function __construct($i,$j){
$this->i = $i;
$this->j = $j;
$this->walls = new jsarray(true,true,true,true);
$this->visited = false;
}
}
function removeWalls($a, $b) {
$x = $a->i - $b->i;
if ($x === 1) {
$a->walls(3,false);
$b->walls(1,false);
} else if (x === -1) {
$a->walls(1,false);
$b->walls(3,false);
}
$y = $a->j - $b->j;
if ($y === 1) {
$a->walls(0,false);
$b->walls(2,false);
} else if (y === -1) {
$a->walls(2,false);
$b->walls(0<false);
}
}
// Setup
for($j = 0;$j < $rows;$j++){
for($i = 0;$i < $cols;$i++){
$cell = new Cell($i,$j);
$grid->push($cell);
}
}
$current = $grid(0);
?>
JSarray Class:
<?php
Class jsarray{
function __construct(...$vals_){
$this->vals = array();
$this->cnt = -1;
if($vals_ != NULL){
if($vals_ > 0 && $vals_ > 1){
foreach($vals_ as $val){
$this->vals[(string) $this->cnt] = $val;
$this->cnt++;
}
}
}
$this->length = $this->cnt+1;
}
function push(...$elements){
if($elements != NULL && $elements > 0){
foreach($elements as $element){
$this->vals[(string) $this->cnt] = $element;
$this->cnt++;
}
}
$this->length = $this->cnt+1;
}
function pop(){
if($this->length > 0){
array_pop($this->vals);
$this->cnt--;
}
$this->length = $this->cnt+1;
}
function __invoke(int $indx,$exchange,...$vals0){
if($indx != NULL && $indx > -1){
return $this->vals[(string) ($indx-1)];
} else if($exchange != NULL && $indx > -1) {
$this->vals[(string) ($indx-1)] = $exchange;
} else if($vals0 != NULL){
$this->vals = array();
$this->cnt = -1;
$this->cnt = -1;
if($vals_ > 0 && $vals_ > 1){
foreach($vals_ as $val){
$this->vals[(string) $this->cnt] = $val;
$this->cnt++;
}
}
}
}
}
function concat(self ...$arrays){
if($arrays > 0 && $arrays != NULL){
$finalarr = $this;
foreach($arrays as $array){
$finalarr->vals = array_merge_recursive($finalarr->vals,$array->vals);
}
$finalarr->length = count($finalarr->vals);
$finalarr->cnt = $finalarr->length-1;
return $finalarr;
}
}
function reverse(){
$this->vals = array_reverse($this->vals);
}
}
// one $ for every line of this file
?>
If anyone is interested I was trying to translate some JS to PHP and the JS and PHP are both on this page: https://github.com/AlexDvorak/PHP-Coding-Train

Answer 1

Missing $ sign on the line } else if (y === -1) {, should be } else if ($y === -1) {.
Also this $b->walls(0<false); should probably be $b->walls(0, false);

Answer 2

You have some errors in removeWalls function. Missing $ sign and invalid arguments
change it like below:
function removeWalls($a, $b) {
$x = $a->i - $b->i;
if ($x === 1) {
$a->walls(3,false);
$b->walls(1,false);
} else if ($x === -1) { //<-------------Mark here
$a->walls(1,false);
$b->walls(3,false);
}
$y = $a->j - $b->j;
if ($y === 1) {
$a->walls(0,false);
$b->walls(2,false);
} else if ($y === -1) { //<-------------Mark here
$a->walls(2,false);
$b->walls(0,false); //<-------------Mark here
}
}