snippet_styles_and_scripts_functions.php

<?php 
//### STYLES
function include_style( $style_name, $file, $array = '', $is_child){
  
  if( $is_child || $is_child == 'child'){
    $file_uri = get_stylesheet_directory_uri() . $file;
    $file_path = get_stylesheet_directory() . $file;
  } else {
    $file_uri = get_template_directory_uri() . $file;
    $file_path = get_template_directory() . $file;
  }
  
  wp_enqueue_style( $style_name, 
                    $file_uri, 
                    array( $array ), 
                    filemtime( $file_path)
                  );
}
//### SCRIPTS
function include_script( $script_name, $file, $array = '', $is_footer, $is_child){
  if( $is_footer == 'header' || $is_footer == '' ){ $is_footer = false; } 
  elseif( $is_footer == 'footer'){ $is_footer = true; }
  
  if( $is_child || $is_child == 'child'){
    $file_uri = get_stylesheet_directory_uri() . $file;
    $file_path = get_stylesheet_directory() . $file;
  } else {
    $file_uri = get_template_directory_uri() . $file;
    $file_path = get_template_directory() . $file;
  }

  wp_register_script( $script_name, 
                      $file_uri, 
                      array( $array ), 
                      filemtime( $file_path), 
                      $is_footer );
  wp_enqueue_script( $script_name );
}

//### Active
function my_styles_and_scripts(){
  include_style( 'style-1', '/css/style_1.css');
  include_style( 'style-2', '/css/style_2.css');
  include_style( 'style-3', '/css/style_3.css');
  include_style( 'style-4', '/css/style_4.css', 'style-1');
  include_style( 'style-5', '/css/style_5.css', 'style-1', 'child');

  //in header
  include_script( 'jq-plugin-1', '/js/jq_plugin_1.js', 'jquery');
  include_script( 'jq-plugin-2', '/js/jq_plugin_2.js', 'jquery', 'header', 'child');
  include_script( 'jq-plugin-3', '/js/jq_plugin_3.js', 'jquery', false, 'child');
  //in footer
  include_script( 'jq-plugin-4', '/js/jq_plugin_4.js', 'jquery', 'footer');
  include_script( 'jq-plugin-5', '/js/jq_plugin_5.js', 'jquery', true);
}

add_action( 'wp_enqueue_scripts', 'my_styles_and_scripts' );


?>