Adding Post Category In Custom Metaboxes of wordpress - wordpress

Question

I want to load my post category in the drop-down select box
how I do this
help me please I am new to programming:
this is my code that creates the custom meta boxes and now in the category boxenter image description here, I want that it loads all the category of post in the drop-down menu: the output of the code is shown in the image attached
<?php
//Start: Adding custom metaboxes
class leaderboarddetailMetabox {
private $screen = array(
'ld-leaderboard',
);
private $meta_fields = array(
array(
'label' => 'Number of Students',
'id' => 'numberofstudent_81418',
'type' => 'number',
),
array(
'label' => 'Select Point Type',
'id' => 'selectpointtype_39141',
'type' => 'select',
'options' => array(
'Select',
'Int',
'Float',
'String',
),
),
array(
'label' => 'Category',
'id' => 'category_59112',
'type' => 'select',
'options' => array(
'Select',
'Course',
'Lesson',
'Topic',
'Quiz',
'Category',
),
),
array(
'label' => 'Time',
'id' => 'time_93126',
'type' => 'date',
),
array(
'label' => 'Shortcode',
'id' => 'shortcode_85946',
'type' => 'text',
'readonly' => true,
),
);
public function __construct() {
add_action( 'add_meta_boxes', array( $this, 'add_meta_boxes' ) );
add_action( 'save_post', array( $this, 'save_fields' ) );
}
// show meta boxes on admin page
public function add_meta_boxes() {
foreach ( $this->screen as $single_screen ) {
add_meta_box(
'leaderboarddetail',
__( 'leader board detail', 'textdomain' ),
array( $this, 'meta_box_callback' ),
$single_screen,
'advanced',
'default'
);
}
}
public function meta_box_callback( $post ) {
wp_nonce_field( 'leaderboarddetail_data', 'leaderboarddetail_nonce' );
$this->field_generator( $post );
}
public function field_generator( $post ) {
$output = '';
foreach ( $this->meta_fields as $meta_field ) {
$label = '<label for="' . $meta_field['id'] . '">' . $meta_field['label'] . '</label>';
$meta_value = get_post_meta( $post->ID, $meta_field['id'], true );
if ( empty( $meta_value ) ) {
$meta_value = $meta_field['default']; }
switch ( $meta_field['type'] ) {
case 'select':
$input = sprintf(
'<select id="%s" name="%s">',
$meta_field['id'],
$meta_field['id']
);
foreach ( $meta_field['options'] as $key => $value ) {
$meta_field_value = !is_numeric( $key ) ? $key : $value;
$input .= sprintf(
'<option %s value="%s">%s</option>',
$meta_value === $meta_field_value ? 'selected' : '',
$meta_field_value,
$value
);
}
$input .= '</select>';
break;
default:
$input = sprintf(
'<input %s id="%s" name="%s" type="%s" value="%s" %s >',
$meta_field['type'] !== 'color' ? 'style="width: 100%"' : '',
$meta_field['id'],
$meta_field['id'],
$meta_field['type'],
$meta_value,
$meta_field['readonly'] ? "readonly" : ""
);
}
$output .= $this->format_rows( $label, $input );
}
echo '<table class="form-table"><tbody>' . $output . '</tbody></table>';
}
public function format_rows( $label, $input ) {
return '<tr><th>'.$label.'</th><td>'.$input.'</td></tr>';
}
// save custom field data to databse and in the field
public function save_fields( $post_id ) {
if ( ! isset( $_POST['leaderboarddetail_nonce'] ) )
return $post_id;
$nonce = $_POST['leaderboarddetail_nonce'];
if ( !wp_verify_nonce( $nonce, 'leaderboarddetail_data' ) )
return $post_id;
if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
return $post_id;
foreach ( $this->meta_fields as $meta_field ) {
if ( isset( $_POST[ $meta_field['id'] ] ) ) {
switch ( $meta_field['type'] ) {
case 'email':
$_POST[ $meta_field['id'] ] = sanitize_email( $_POST[ $meta_field['id'] ] );
break;
case 'text':
$_POST[ $meta_field['id'] ] = sanitize_text_field( $_POST[ $meta_field['id'] ] );
break;
}
update_post_meta( $post_id, $meta_field['id'], $_POST[ $meta_field['id'] ] );
} else if ( $meta_field['type'] === 'checkbox' ) {
update_post_meta( $post_id, $meta_field['id'], '0' );
}
// generate shortcode and save
if( $meta_field['id'] == 'shortcode_85946' ) {
// update meta
update_post_meta( $post_id, $meta_field['id'], "[custom-shortcode id=" . $post_id . "]");
}
}
}
}
if (class_exists('leaderboarddetailMetabox')) {
new leaderboarddetailMetabox;
};
?>