我有以下自定义控件/设置来控制图像的不透明度：

// Image Opacity
$wp_customize->add_setting( \'image_opacity\', array(
    \'default\'           => \'1.000\',
    \'sanitize_callback\' => \'my_theme_sanitize_number_range\'
) );
$wp_customize->add_control( \'image_opacity\', array(
    \'label\'             => __( \'Image Opacity\', \'my-theme\' ),
    \'type\'              => \'range\',
    \'input_attrs\'       => array(
        \'min\'           => 0,
        \'max\'           => 1.000,
        \'step\'          => 0.001,
    ),
) );

以及以下清理功能：

// Sanitize Number Range
function my_theme_sanitize_number_range( $number, $setting ) {
    $number = absint( $number );
    $atts = $setting->manager->get_control( $setting->id )->input_attrs;
    $min = ( isset( $atts[\'min\'] ) ? $atts[\'min\'] : $number );
    $max = ( isset( $atts[\'max\'] ) ? $atts[\'max\'] : $number );
    $step = ( isset( $atts[\'step\'] ) ? $atts[\'step\'] : 0.001 );
    return ( $min <= $number && $number <= $max && is_int( $number / $step ) ? $number : $setting->default );
}

它可以很好地处理整数，比如\'max\' => 1, 和\'step\' => 1 但我想让步骤变成三个小数点，比如\'step\' => 0.001, 这是行不通的。

我如何做到这一点？

$number = floor($number / $atts[\'step\']) * $atts[\'step\'];

return ( $min <= $number && $number <= $max ) ? $number : $setting->default;