Change post thumbnail on using front end post edit form [closed] - php

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I'm trying to get the post thumbnail to change if a user selects a new file on a front end post edit screen. This is similar to the code I use to upload data and set the post thumbnail on a front end add new post form:
<?php
$query = new WP_Query( array( 'post_type' => 'properties', 'posts_per_page' => '-1' ) );
if ( $query->have_posts() ) : while ( $query->have_posts() ) : $query->the_post();
if(isset($_GET['post'])) {
if($_GET['post'] == $post->ID)
{
$current_post = $post->ID;
$content = get_the_content();
$price = get_post_meta($post->ID, 'shru_price', true);
$address = get_post_meta($post->ID, 'shru_address', true);
$thumbnail = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'single-image' );
}
}
endwhile; endif;
wp_reset_query();
global $current_post;
$postContentError = '';
if ( isset( $_POST['submitted'] ) && isset( $_POST['post_nonce_field'] ) && wp_verify_nonce( $_POST['post_nonce_field'], 'post_nonce' ) ) {
if ( trim( $_POST['postContent'] ) === '' ) {
$postContentError = 'Please enter a description of this property.';
$hasError = true;
}
$post_information = array(
'ID' => $current_post,
'post_content' => $_POST['postContent'],
'post_type' => 'properties',
'post_status' => 'publish'
);
$post_id = wp_update_post($post_information);
function upload_user_file( $file = array() ) {
global $post_id;
require_once( ABSPATH . 'wp-admin/includes/admin.php' );
$file_return = wp_handle_upload( $file, array('test_form' => false ) );
if( isset( $file_return['error'] ) || isset( $file_return['upload_error_handler'] ) ) {
return false;
} else {
$filename = $file_return['file'];
$attachment = array(
'post_mime_type' => $file_return['type'],
'post_title' => preg_replace( '/\.[^.]+$/', '', basename( $filename ) ),
'post_content' => '',
'post_status' => 'inherit',
'guid' => $file_return['url']
);
$attachment_id = wp_insert_attachment( $attachment, $file_return['url'], $post_id );
require_once(ABSPATH . 'wp-admin/includes/image.php');
$attachment_data = wp_generate_attachment_metadata( $attachment_id, $filename );
wp_update_attachment_metadata( $attachment_id, $attachment_data );
if( 0 < intval( $attachment_id ) ) {
return $attachment_id;
}
}
return false;
}
if( ! empty( $_FILES ) ) {
foreach( $_FILES as $file ) {
if( is_array( $file ) ) {
$attachment_id = upload_user_file( $file );
}
}
}
$propertyfor = $_POST['propertyfor'];
$propertytype = $_POST['propertytype'];
$bedrooms = $_POST['bedrooms'];
if($post_id) {
// Update Custom Meta
update_post_meta($post_id, 'shru_price', esc_attr(strip_tags($_POST['shru_price'])));
update_post_meta($post_id, 'shru_address', esc_attr(strip_tags($_POST['shru_address'])));
update_post_meta($post_id, '_thumbnail_id', $attachment_id );
wp_set_object_terms( $post_id, $propertyfor, 'propertyfor' );
wp_set_object_terms( $post_id, $propertytype, 'propertytype' );
wp_set_object_terms( $post_id, $bedrooms, 'bedrooms' );
// Redirect
wp_redirect(home_url('/listings'));
exit;
}
}
?>
The only difference is that in the code above I am trying to use:
update_post_meta($post_id, '_thumbnail_id', $attachment_id );
instead of:
set_post_thumbnail($post_id, $attachment_id);
For some reason, on the post edit screen the image file does not even upload. When I use update post meta, it removes the old thumbnail, so I guess it's doing it's job there, but since the file isn't uploading it cannot replace it with a new one. The confusion is why the file uploads using the upload_user_file function on the add new post screen but not the edit post screen.
Any ideas?