This is a helper class for creating settings pages, for plugins. Using this, you can just create one large array of data rather than having to manage all the functions and hooks that WordPress requires for a settings page.

azm_settings_page.php

<?php

if ( ! class_exists( 'AZM_Settings_Page' ) ) {

	class AZM_Settings_Page {

		/***********************************************************************/
		/***************************  CONSTRUCTOR  *****************************/
		/***********************************************************************/

		public $prefix;
		public $page;
		public $tabs;

		function __construct( $params ) {

			// HANDLE USER DEFINED PARAMETERS

			$this->prefix = $params['prefix'];

			$this->page = [
				'page_title' => $params['page']['page_title'],
				'menu_title' => $params['page']['menu_title'],
				'capability' => $params['page']['capability'],
				'menu_slug' => $this->prefix . '_' . $params['page']['menu_slug'],
				'desc' => $params['page']['desc']
			];

			$this->tabs = $params['page']['tabs'];

			// REGISTER MENU PAGE AND SETTINGS

			add_action( 'admin_menu', array( $this, 'azm_register_settings_page' ) );
			add_action( 'admin_init',  array( $this, 'azm_initialize_settings' ) );
			add_action( 'admin_head',  array( $this, 'azm_add_toggle_styles' ) ); 

		}

		public function azm_add_toggle_styles() {

			echo '<style>.input-toggle {height:30px;}.input-toggle input {position: absolute;margin-left: -9999px;visibility: hidden;}.input-toggle input + label {display: block;position: absolute;cursor: pointer;outline: none;user-select: none;}.input-toggle input + label {width: 60px;height: 30px;border-radius: 15px;}.input-toggle input + label.toggle {width: 60px;height: 30px;border-radius: 15px;}.input-toggle input + label.toggle::before,.input-toggle input + label.toggle::after {display: block;position: absolute;top: 0px;left: 0px;bottom: 0px;content: "";}.input-toggle input + label.toggle::before {right: 0px;background-color:rgba(210, 210, 210,1);border-radius: 15px;transition: background 0.4s;}.input-toggle input + label.toggle:after {width: 50%;background-color: #fff;border-radius: 100%;box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);transition: transform 0.4s;}.input-toggle input:checked + label.toggle {pointer-events:none;}.input-toggle input:checked + label.toggle::before {background-color: rgba(255,255,255,0.1);}.input-toggle input:checked + label.toggle::after {transform:translateX(100%);}</style>';

		}

		public function azm_register_settings_page() {

			add_options_page(  
				$this->page['page_title'],
				$this->page['menu_title'],
				$this->page['capability'],
				$this->page['menu_slug'],
				array( $this, 'azm_create_settings_page' )
			);	

		}

		public function azm_create_settings_page() {

			// SET TAB TO FIRST BY DEFAULT

			$active_tab_slug = $this->prefix . '_tab_' . $this->tabs[0]['slug'];

			// IF THERE IS A USER PROVIDED ONE, MEANING THE USER HAS CLICKED ON A TAB:

			if ( array_key_exists( 'tab', $_GET ) ) {

				// GRAB IT AND SANITIZE IT

				$user_provided_tab_slug = sanitize_key( $_GET['tab'] );

				// LOOP THROUGH ALL POSSIBLE TABS TO SEE IF THE USER PROVIDED TEXT REALLY IS AN OPTION

				foreach ( $this->tabs as $tab ) {

					if ( $user_provided_tab_slug == $this->prefix . '_tab_' . $tab['slug'] ) {

						$active_tab_slug = $user_provided_tab_slug;

					}

				}

			}

			echo '

			<div class="wrap">

				<h2>' . $this->page['page_title'] . '</h2>

				<form method="post" enctype="multipart/form-data" action="options.php">

				' . $this->page['desc'] . '

				<h2 class="nav-tab-wrapper">';

				foreach( $this->tabs as $tab ) {

					$tab_slug = $this->prefix . '_tab_' . $tab['slug'];

					echo '<a href="?page=' . $this->page['menu_slug'] . '&tab=' . $tab_slug . '" class="nav-tab' . ( $active_tab_slug == $tab_slug ? ' nav-tab-active' : '' ) . '">' . $tab['label'] . '</a>';

				}

				echo '</h2>';

				settings_fields( str_replace( 'tab', 'group', $active_tab_slug ) );
				do_settings_sections(str_replace( 'tab', 'options', $active_tab_slug ) );
				submit_button();

				echo '	

				</form>

			</div>';

		}

		public function azm_initialize_settings() {

			foreach( $this->tabs as $tab ) {

				foreach( $tab['sections'] as $section ) {

					add_settings_section(
						$this->prefix . '_tab_' . $tab['slug'] . '_section_' . $section['slug'],
						$section['heading'],
						function ( $section_passed ) use ( $section ) {
							echo $section['desc'];
						},
						$this->prefix . '_options_' . $tab['slug']
					);

					foreach( $section['fields'] as $field ) {

						add_settings_field(
							$this->prefix . '_' . $field['slug'],
							$field['label'],
							array( $this, 'azm_field_callback' ),
							$this->prefix . '_options_' . $tab['slug'],
							$this->prefix . '_tab_' . $tab['slug'] . '_section_' . $section['slug'],
							[
								'option' => $this->prefix . '_options_' . $tab['slug'],
								'key' => $this->prefix . '_' . $field['slug'],
								'type' => $field['type'],
								'choices' => $field['choices'],
								'default' => $field['default'],
								'desc' => $field['desc'],
								'placeholder' => $field['placeholder'],
								'beforeInput' => $field['beforeInput'],
								'afterInput' => $field['afterInput']
							]
						);

					}

					/*********************************************/
					/********  REGISTER THE TAB SETTING  *********/
					/*********************************************/

					register_setting(
						$this->prefix . '_group_' . $tab['slug'], 
						$this->prefix . '_options_' . $tab['slug'],
						array( $this, 'azm_validation' )
					);

				}

			}

		}

		public function azm_field_callback( $params ) {

			global $admin_colors; 

			$option = array_key_exists('option', $params) ? $params['option'] : '';
			$key = array_key_exists('key', $params) ? $params['key'] : '';
			$type = array_key_exists('type', $params) ? $params['type'] : 'text';
			$desc = array_key_exists('desc', $params) ? $params['desc'] : '';
			$placeholder = array_key_exists('placeholder', $params) ? $params['placeholder'] : '';
			$choices = array_key_exists('choices', $params) ? $params['choices'] : '';
			$default = array_key_exists('default', $params) ? $params['default'] : '';
			$beforeInput = array_key_exists('beforeInput', $params) ? $params['beforeInput'] : '';
			$afterInput = array_key_exists('beforeInput', $params) ? $params['afterInput'] : '';

			$options = get_option($option) ? get_option($option) : [];
			$value = array_key_exists($key, $options) ? $options[$key] : $default;

			echo $beforeInput;

			switch ( $type ) {
				case 'textarea':
					echo '<textarea name="' . $option . '[' . $key . ']" id="' . $key . '" placeholder="' . $placeholder . '">' . $options[$key] . '</textarea>';
					break;
				case 'toggle':
					echo '
						<div class="input-toggle" id="' . $key . '">
							<input name="' . $option . '[' . $key . ']" id="' . $key . '_' . $choices[0] . '" placeholder="' . $placeholder . '" value="' . $choices[0] . '" type="radio" ' . checked( $value, $choices[0], false ) .'>
							<label for="' . $key . '_' . $choices[0] . '"></label>
							<input name="' . $option . '[' . $key . ']" id="' . $key . '_' . $choices[1] . '" placeholder="' . $placeholder . '" value="' . $choices[1] . '" type="radio" ' . checked( $value, $choices[1], false ) .'>
							<label for="' . $key . '_' . $choices[1] . '" class="toggle" style="background-color: ' . $admin_colors . '"></label>
						</div>';
					break;
				case 'select':
					echo '<select name="' . $option . '[' . $key . ']" id="' . $key . '">';
					foreach ( $choices as $selectValue => $selectLabel ) {
						echo '<option value="' . $selectValue . '"' . ( $value == $selectValue ? ' selected="selected"' : '' ).'>' . $selectLabel . '</option>';
					}
					echo '</select>';
					break;
				default:
					echo '<input name="' . $option . '[' . $key . ']" id="' . $key . '" placeholder="' . $placeholder . '" type="' . $type . '" value="' . $options[$key] . '" class="regular-text" />';
					break;
			}

			echo $afterInput;

			echo '<p class="description">' . $desc . '</p>';

		}

		public function azm_validation( $input ) {

			$output = array();

			foreach( $input as $key => $value ) {

				if ( isset( $input[$key] ) ) {

					$output[$key] = strip_tags( stripslashes( $input[ $key ] ) );

				}

			}

			return apply_filters('azm_validation', $output, $input);

		}

	}
}