Generates random characters with random background and foreground colors.

colorful-characters.php

<?php
    
    function randColor() {
        $randDec = rand(0, 16777215);
        $randHex = dechex($randDec);
        
        $color = '#' . $randHex;
        
        return $color;
    }
    
    function randChar() {
        // Define possible characters
        $chars = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ!@#$%^&*()-_=+[];,./{}:<>?\|~';
    
        // Pick a random char
        $x =  rand(0, strlen($chars)-1);
        $char = $chars{$x};
    
        return $char;
    }

?>

<?php $i = 0; while ($i < 2500): ?>
        
    <span style="background-color: <?= randColor(); ?>; color: <?= randColor(); ?>; display: inline-block; float: left; padding: 2px 0; text-align: center; width: 12px;">
        <?= randChar(); ?>
    </span>
        
<?php $i++; endwhile; ?>