printing a chess table in php without using for loop-CodePudding

hello how can i print a chess table in PHP without using for loops, is it possible to do it with conditional and logical statements only?

<table width = "270px" cellspacing = "0px" cellpadding = "0px" border = "1px" bordercolor = "gray"> 
<?php 
            $value = 0;
            
            for($col = 0; $col < 8; $col  ) {
                echo "<tr>";
                $value = $col;
                
                for($row = 0; $row < 8; $row  ) {
                    if($value%2 == 0) {
                        echo
                        "<td height=40px width=20px bgcolor=black></td>";
                        $value  ;
                    }
                    else {
                        echo
                        "<td height=40px width=20px bgcolor=white></td>";
                        $value  ;
                    }
                }
                echo "</tr>";
            }
            ?>

CodePudding user response：

You could use str_repeat:

<table width="270px" cellspacing="0" cellpadding="0" border="1px" bordercolor="gray"> 
<?php 
$td = '<td height="40px" width="20px" bgcolor=';
$black = "$td'black'></td>";
$white = "$td'white'></td>";
echo str_repeat("<tr>" . str_repeat($black . $white, 4) . "</tr><tr>" 
                       . str_repeat($white . $black, 4) . "</tr>", 4);
?>
</table>

CodePudding user response：

One solution is to use build-in loops derived from some functions, here array_walk(only to avoid explicit for).But it the end the algorithm is the same. It's only a trick !

<?php 
$arr = array_fill(0,64,1);
array_walk($arr,"construct");
array_walk($arr,"display");
function construct(&$item, $key)
{
    $color=$key%2;
    
    $i=($key-$key%8)/8   1;
    if($i%2==0)
        $color = ($color 1)%2;
    $color = $color%2==0 ? "white" : "black";
    $j=$key%8 1;
    $item = new Square($i,$j,$color);
}
function display($item, $key)
{
    if($key%8==0) echo "<br>";
    echo $item." ";
    
}

class Square
{
    public $i;
    public $j;
    public $color;
    public function __construct($i,$j,$color)
    {
        $this->i=$i;
        $this->j=$j;
        $this->color=$color;
    }
    public function __toString()
    {
        return "[".$this->i.",".$this->j."]=".($this->color);
    }
}
?>

Output:

[1,1]=white [1,2]=black [1,3]=white [1,4]=black [1,5]=white [1,6]=black [1,7]=white [1,8]=black
[2,1]=black [2,2]=white [2,3]=black [2,4]=white [2,5]=black [2,6]=white [2,7]=black [2,8]=white
[3,1]=white [3,2]=black [3,3]=white [3,4]=black [3,5]=white [3,6]=black [3,7]=white [3,8]=black
[4,1]=black [4,2]=white [4,3]=black [4,4]=white [4,5]=black [4,6]=white [4,7]=black [4,8]=white
[5,1]=white [5,2]=black [5,3]=white [5,4]=black [5,5]=white [5,6]=black [5,7]=white [5,8]=black
[6,1]=black [6,2]=white [6,3]=black [6,4]=white [6,5]=black [6,6]=white [6,7]=black [6,8]=white
[7,1]=white [7,2]=black [7,3]=white [7,4]=black [7,5]=white [7,6]=black [7,7]=white [7,8]=black
[8,1]=black [8,2]=white [8,3]=black [8,4]=white [8,5]=black [8,6]=white [8,7]=black [8,8]=white

For html grid, just adapt display.

function displayHtml($item, $key)
{
    if($item->i==1 && $item->j==1)
        echo '<table width="270px" cellspacing="0" cellpadding="0" border="1px" bordercolor="gray">';
    if($item->j%8==1)
        echo "<tr>";
    echo "<td height=40px width=20px style='background-color:".$item->color."'></td>";
    if($item->j%8==0)
        echo "</tr>";
    if($item->i==8 && $item->j==8)
        echo "</table>";
}