dynamic-css-by-vfprintf

// https://codex.wordpress.org/Plugin_API/Action_Reference/customize_register
function vfprintfCustomize($arg){

    $arg -> add_section('header_id',array(
        'title'=>'Header Option Firoze',
        'priority'=>120
    ));

    $arg -> add_setting('text_color_change',array(
        'default'        => '#111',
        'transport'     => 'postMessage',
    ));
    $arg -> add_control('text_color_change',array(
        'label'      => __('Color Scheme', 'themename'),
        'section'    => 'header_id',
        'type'       => 'color'

    ));
}

add_action('customize_register','vfprintfCustomize');


// create style.css and generate dynamic css
$color = get_theme_mod("text_color_change");
$file = fopen(get_stylesheet_directory()."/dynamic.css","w");
vfprintf(
    $file,
    "
    .site_title,.site-description,body{color:%s !important;}
    ",
    array($color)
);

function my_danamic_css(){
?>
    <?php if(file_exists(get_stylesheet_directory()."/dynamic.css")):?>
        <link rel="stylesheet" type="text/css" href="<?php echo get_theme_file_uri("dynamic.css");?>">
    <?php endif;?>
<?php
}
add_action("wp_head","my_danamic_css");