Quickly add multiple custom color settings and controls to a Wordpress theme's Customizer

add-custom-colors.php

<?php

function my_theme_add_setting_control($wp_customize, $color, $options)
{

  $key = $color[0];
  $label = $color[1];
  $default_hex = $color[2];

  $section = $options['section'];
  $text_domain = $options['text_domain'];

  $wp_customize->add_setting($key, array(
    'default'           => $default_hex ?? '#000',
    'sanitize_callback' => 'sanitize_hex_color',
    'capability'        => 'edit_theme_options',
    'type'           => 'option',
  ));

  $wp_customize->add_control(new WP_Customize_Color_Control($wp_customize, $key, array(
    'label'    => __($label, $text_domain),
    'section'  => $section,
    'settings' => $key,
  )));
}

function my_theme_customize_register($wp_customize)
{
  $options = ['section' => 'colors', 'text_domain' => 'my_theme'];

  $custom_colors = [
    ['my_theme_light_bg_color', 'Background color (light)', '#d8b65f'],
    ['my_theme_light_text_color', 'Text color (light)', '#000000'],
    ['my_theme_dark_bg_color', 'Background color (dark)', '#10181E'],
    ['my_theme_dark_text_color', 'Text color (dark)', '#C7BDAD'],
    ['my_theme_hacker_bg_color', 'Background color (hacker)', '#0A0D07'],
    ['my_theme_hacker_text_color', 'Text color (hacker)', '#4AAC2F'],
  ];

  foreach ($custom_colors as $color) {
    my_theme_add_setting_control($wp_customize, $color, $options);
  }
}

add_action('customize_register', 'my_theme_customize_register');

?>