从PHP生成渐变颜色

<?php
function generateGradient($startColor, $endColor, $steps) {
    $startRGB = hexToRGB($startColor);
    $endRGB = hexToRGB($endColor);
    
    $colors = array();
    
    for ($i = 0; $i <= $steps; $i++) {
        $r = interpolate($startRGB['r'], $endRGB['r'], $steps, $i);
        $g = interpolate($startRGB['g'], $endRGB['g'], $steps, $i);
        $b = interpolate($startRGB['b'], $endRGB['b'], $steps, $i);
        
        $color = RGBToHex($r, $g, $b);
        $colors[] = $color;
    }
    
    return $colors;
}

function interpolate($start, $end, $steps, $count) {
    $stepSize = ($end - $start) / $steps;
    return round($start + ($stepSize * $count));
}

function hexToRGB($hex) {
    $hex = ltrim($hex, '#');
    $rgb = array();
    $rgb['r'] = hexdec(substr($hex, 0, 2));
    $rgb['g'] = hexdec(substr($hex, 2, 2));
    $rgb['b'] = hexdec(substr($hex, 4, 2));
    return $rgb;
}

function RGBToHex($r, $g, $b) {
    $hex = "#";
    $hex .= str_pad(dechex($r), 2, "0", STR_PAD_LEFT);
    $hex .= str_pad(dechex($g), 2, "0", STR_PAD_LEFT);
    $hex .= str_pad(dechex($b), 2, "0", STR_PAD_LEFT);
    return $hex;
}

$startColor = "#FF0000"; // 红色
$endColor = "#0000FF"; // 蓝色
$steps = 10; // 渐变步数

$gradient = generateGradient($startColor, $endColor, $steps);

foreach ($gradient as $color) {
    echo "<div style='background-color: $color; width: 50px; height: 50px;'></div>";
}
?>