generate form inputs (untested)

generate_form_inputs.php

<?php

add_action( 'add_item_form_html', 'dw_add_item_form' );
function dw_add_item_form() {
	$args = [
		[
			'type'  => 'wrapper_start',
			'class' => 'row',
		],
		[
			'type' => 'wrapper_end'
		],
		[
			'type'          => 'radio',
			'name'          => 'input_nddame',
			'label'         => 'Select Genger',
			'class'         => 'holder',
			'value'         => 'female',
			'options'       => [
				'male'   => 'Male',
				'female' => 'Female',
			],
			'wrapper_start' => '',
			'wrapper_end'   => '',
		],
		[
			'type'          => 'text',
			'name'          => 'input_name',
			'placeholder'   => 'holder',
			'label'         => 'holder',
			'id'            => 'holderb',
			'value'         => 'holdern',
			'class'         => 'holder',
			'wrapper_start' => '',
			'wrapper_end'   => '',
		],
		[
			'type'          => 'select',
			'name'          => 'input_name',
			'label'         => 'holder',
			'id'            => 'holds',
			'value'         => 'opt_key4',
			'class'         => 'holder',
			'options'       => [
				'opt_key1' => 'Option Key 1',
				'opt_key2' => 'Option Key 2',
				'opt_key3' => 'Option Key 3',
				'opt_key4' => 'Option Key 4',
			],
			'wrapper_start' => '',
			'wrapper_end'   => '',
		],
		[
			'type'          => 'multi_select',
			'name'          => 'input_ddname',
			'placeholder'   => 'holder',
			'label'         => 'holder',
			'id'            => 'hosdlds',
			'value'         => [ 'opt_key1', 'opt_key2' ],
			'class'         => 'holder',
			'options'       => [
				'opt_key1' => 'Option Key 1',
				'opt_key2' => 'Option Key 2',
				'opt_key3' => 'Option Key 3',
				'opt_key4' => 'Option Key 4',
			],
			'wrapper_start' => '',
			'wrapper_end'   => '',
		],


	];
	?>
    <div class="form-content">
		<?php
		foreach ( $args as $arg ) {
			dw_form_inputs_builder( $arg );
		}
		?>
    </div>
	<?php
}

function dw_form_inputs_builder( $arg, $echo = true ) {
	$output = $class = $id = $name = $placeholder = $wrapper_start = $wrapper_end = '';

	if ( isset( $arg['wrapper_start'] ) ) {
		if ( ! empty( $arg['wrapper_start'] ) ) {
			$output .= $arg['wrapper_start'];
		} else {
			$output .= '<div class="form-group">';
		}
	}

	switch ( $arg['type'] ) {
		case 'wrapper_start':
			if ( isset( $arg['class'] ) ) {
				$class = 'class="' . esc_attr( $arg['class'] ) . '"';
			}
			if ( isset( $arg['id'] ) ) {
				$id = 'id="' . esc_attr( $arg['id'] ) . '"';
			}
			$output .= "<div $class $id>";
			break;
		case 'wrapper_end':
			$output .= "</div>";
			break;
		case 'text':
			if ( $arg['label'] ) {
				$output .= sprintf( '<label for="%s">%s',
					$arg['id'],
					$arg['label']
				);
			}
			if ( $arg['label'] ) {
				$output .= '</label>';
			}
			$output .= sprintf( '<input name="%s" id="%s" class="form-control %s" type="text" placeholder="%s" value="%s" />',
				esc_attr( $arg['name'] ),
				esc_attr( $arg['id'] ),
				esc_attr( $arg['class'] ),
				esc_attr( $arg['placeholder'] ),
				esc_attr( $arg['value'] )
			);

			break;
		case 'password':
			if ( $arg['label'] ) {
				$output .= sprintf( '<label for="%s">%s',
					$arg['id'],
					$arg['label']
				);
			}
			if ( $arg['label'] ) {
				$output .= '</label>';
			}
			$output .= sprintf( '<input name="%s" id="%s" class="form-control %s" type="password" placeholder="%s" value="%s" />',
				esc_attr( $arg['name'] ),
				esc_attr( $arg['id'] ),
				esc_attr( $arg['class'] ),
				esc_attr( $arg['placeholder'] ),
				esc_attr( $arg['value'] )
			);

			break;
		case 'hidden':
			$output .= sprintf( '<input name="%s" type="hidden" value="%s"/>',
				esc_attr( $arg['name'] ),
				esc_attr( $arg['value'] )
			);
			break;
		case 'select':
			if ( $arg['label'] ) {
				$output .= sprintf( '<label for="%s">%s',
					$arg['id'],
					$arg['label']
				);
			}
			if ( $arg['label'] ) {
				$output .= '</label>';
			}

			$output  .= sprintf( '<select name="%s" id="%s" class="form-control %s">',
				esc_attr( $arg['name'] ),
				esc_attr( $arg['id'] ),
				esc_attr( $arg['class'] )
			);
			$attr    = '';
			$options = '';
			foreach ( $arg['options'] as $key => $label ) {
				$options .= sprintf( '<option value="%s" %s>%s</option>',
					$key,
					selected( $arg['value'], $key, false ),
					$label
				);
			}
			$output .= $options;
			$output .= '</select>';

			break;
		case 'multi_select':
			if ( $arg['label'] ) {
				$output .= sprintf( '<label for="%s">%s',
					$arg['id'],
					$arg['label']
				);
			}
			if ( $arg['label'] ) {
				$output .= '</label>';
			}

			$output  .= sprintf( '<select name="%s" id="%s" class="form-control %s" multiple>',
				esc_attr( $arg['name'] ),
				esc_attr( $arg['id'] ),
				esc_attr( $arg['class'] )
			);
			$attr    = '';
			$options = '';
			foreach ( $arg['options'] as $key => $label ) {
				$options .= sprintf( '<option value="%s" %s>%s</option>',
					$key,
					selected( ( in_array( $key, $arg['value'] ) ? $key : '' ), $key, false ),
					$label
				);
			}
			$output .= $options;
			$output .= '</select>';

			break;
		case 'radio':
			$options = '';
			if ( $arg['label'] ) {
				$options .= sprintf( '<label>%s</label>',
					$arg['label']
				);
			}
			$options .= '<div class="form-group">';
			$options .= '<div class="btn-group btn-group-toggle" data-toggle="buttons">';
			foreach ( $arg['options'] as $key => $label ) {
				$options .= sprintf( '<label class="btn btn-outline-dark %s">',
					checked( $arg['value'], $key, false ) ? 'active' : ''
				);
				$options .= sprintf( '<input type="radio" class="form-control" id="%s" name="%s" value="%s" %s>%s',
					$key,
					$arg['name'],
					$key,
					checked( $arg['value'], $key, false ),
					$label
				);
				$options .= '</label>';

			}
			$options .= '</div>';
			$options .= '</div>';
			$output  .= $options;

			break;
	}

	if ( isset( $arg['wrapper_end'] ) ) {
		if ( ! empty( $arg['wrapper_end'] ) ) {
			$output .= $arg['wrapper_end'];
		} else {
			$output .= '</div>';
		}
	}

	if ( $echo ) {
		echo $output;
	} else {
		return $output;
	}
}