function checkCell($cells, $x, $y, $sizeX, $sizeY){
    $counter = 0;
    $cellState = $cells[$x][$y];
    for($ycell = $y-1; $ycell < $y+1; $ycell++){
        if($ycell >= 0 && $ycell < $sizeY){
            for($xcell = $x-1; $xcell < $x+1; $xcell++){
                if($xcell >= 0 && $xcell < $sizeX){
                    // SI CELLULE VIVANTE ET DIFFERENTE DE CELLULE CENTRALE
                    if($cells[$xcell][$ycell] == 'o'){
                        $counter++;
                    }
                }
            }
        }
    }
    if($cellState == 'o') {
        if($counter > 3 || $counter < 2)
            $cellState = ' ';
    }
    if($counter == 3){
        $cellState = 'o';
        console_log("Generate");
    }
    return $cellState;
}