need to add attach thumbnail from my form

Question

i need to add [attach thumbnail] to this form

functions.php Code:

if( 'POST' == $_SERVER['REQUEST_METHOD'] && !empty( $_POST['action'] ) &&  $_POST['action'] == "new_post") {

    // Do some minor form validation to make sure there is content
    $title =  $_POST['title'];
    $ordertype = $_POST['ordertype'];
    $price = $_POST['price'];
    $ordertime = $_POST['ordertime'];

    // Add the content of the form to $post as an array
    $new_post = array(
        'post_title'    => $title,
        'post_content'  => $description,
        'post_category' => array($_POST['category']),
        'post_status'   => 'publish',
        'post_type' => 'post'
    );
    //save the new post
    $pid = wp_insert_post($new_post); 
    add_post_meta($pid, 'ordertype', $ordertype, true);
    add_post_meta($pid, 'price', $price, true);
    add_post_meta($pid, 'ordertime', $ordertime, true);
    wp_redirect('/'); exit;
    //insert taxonomies
}

source: Form to Add Posts to Custom Post Type

Answer 1

Its pretty simple actually. Here is the link for the set_thumbnail function reference codex. And here is the answer for the file upload.

First off all you have to attach the file to the post :

function attach_uploads($uploads,$post_id = 0){
$files = rearrange($uploads);
if($files[0]['name']==''){
    return false;   
}
foreach($files as $file){
    $upload_file = wp_handle_upload( $file, array('test_form' => false) );
    $attachment = array(
    'post_mime_type' => $upload_file['type'],
    'post_title' => preg_replace('/\.[^.]+$/', '', basename($upload_file['file'])),
    'post_content' => '',
    'post_status' => 'inherit'
);
    $attach_id = wp_insert_attachment( $attachment, $upload_file['file'], $post_id );
    $attach_array[] = $attach_id;
    require_once(ABSPATH . 'wp-admin/includes/image.php');
    $attach_data = wp_generate_attachment_metadata( $attach_id, $upload_file['file'] );
    wp_update_attachment_metadata( $attach_id, $attach_data );
}
return $attach_array;
}

More detail about the php file upload rearrangement : php.net.

And this is the function to set the uploaded file as post thumbnail. Put it in the corresponding wp_ajax function.

// put this one early, before any process
$files = $_FILES['profile-picture'];

// insert attachment, after you have the new post id of course
$attached_files = attach_uploads($files,$pid);

// set the first file as post thumbnail
// $attached_files[0] is for the first file

if($attached_files){
    set_post_thumbnail( $pid, $attached_files[0] ); 
}

Hope this help

ADDED :

function rearrange( $arr ){
    foreach( $arr as $key => $all ){
        foreach( $all as $i => $val ){
            $new[$i][$key] = $val;    
        }    
    }
    return $new;
}

Just put it in the functions.php

Answer 2

thanks @ifdion .. That is my finally functions.php code

if( 'POST' == $_SERVER['REQUEST_METHOD'] && !empty( $_POST['action'] ) &&  $_POST['action'] == "new_post") {

    // Do some minor form validation to make sure there is content
    $title =  $_POST['title'];
    $ordertype = $_POST['ordertype'];
    $price = $_POST['price'];
    $ordertime = $_POST['ordertime'];
    $files = $_FILES['profile-picture'];

    // Add the content of the form to $post as an array
    $new_post = array(
        'post_title'    => $title,
        'post_content'  => $description,
        'post_category' => array($_POST['category']),  // Usable for custom taxonomies too
        'post_status'   => 'publish',           // Choose: publish, preview, future, draft, etc.
        'post_type' => 'post'  //'post',page' or use a custom post type if you want to
    );
    //save the new post
    $pid = wp_insert_post($new_post); 
    add_post_meta($pid, 'ordertype', $ordertype, true);
    add_post_meta($pid, 'price', $price, true);
    add_post_meta($pid, 'ordertime', $ordertime, true);
    $attached_files = attach_uploads($files,$pid);
    if($attached_files){
    set_post_thumbnail( $pid, $attached_files[0] ); 
    }
    wp_redirect(get_permalink($pid)); exit;
    //insert taxonomies
}
function attach_uploads($uploads,$post_id = 0){
    $files = rearrange($uploads);
    if($files[0]['name']==''){
        return false;   
    }
    foreach($files as $file){
        $upload_file = wp_handle_upload( $file, array('test_form' => false) );
        $attachment = array(
        'post_mime_type' => $upload_file['type'],
        'post_title' => preg_replace('/\.[^.]+$/', '', basename($upload_file['file'])),
        'post_content' => '',
        'post_status' => 'inherit'
    );
        $attach_id = wp_insert_attachment( $attachment, $upload_file['file'], $post_id );
        $attach_array[] = $attach_id;
        require_once(ABSPATH . 'wp-admin/includes/image.php');
        $attach_data = wp_generate_attachment_metadata( $attach_id, $upload_file['file'] );
        wp_update_attachment_metadata( $attach_id, $attach_data );
    }
    return $attach_array;
}

and this upload [input] in theme..

<input type="file" id="profile-picture" name="profile-picture[]" size="40" multiple />

but if i do submit for form, responding with this error...

Fatal error: Call to undefined function rearrange()

sorry for your time