Find out file handles in WordPress

functions.php

<?php
add_action( 'wp_head', 'check_jquery' );
add_action( 'admin_head', 'check_jquery' );

function check_jquery() {

    global $wp_scripts;
    global $wp_styles;

    //foreach ( $wp_scripts->registered as $wp_script ) {
    //    $handles[] = $wp_script->handle; 
    //}

    foreach ( $wp_styles->registered as $wp_script ) {
        $handles[] = $wp_script->handle; 
    }
    
	  print_r($handles);
}