Just some grid ball animation thing I threw away

svg-grid.php

<?php 
    $w = 20;
    $h = 3;
    $spacing = 7;
    $padding = 2;
?>
<svg
    xmlns="http://www.w3.org/2000/svg"
    viewBox="<?php echo -$padding; ?> <?php echo -$padding;  ?> <?php echo $w * $spacing + $padding * 2; ?> <?php echo $h * $spacing + $padding * 2; ?>"
    version="1.1">
    <?php foreach (range(0, $w) as $x): ?>
        <?php foreach (range(0, $h) as $y): ?>
        <circle 
            cx="<?php echo $x * $spacing; ?>" 
            cy="<?php echo $y * $spacing; ?>" 
            r="0.4"
            >
            <animate attributeName="r" begin="0s" dur="3s" repeatCount="indefinite" 
                values="0.4;0.7;0.4" 
                keyTimes="0;0.5;1" 
                repeatCount="indefinite" />


        </circle>
        <?php endforeach; ?>
    <?php endforeach; ?>
</svg>