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I want to insert newpost on Front-end of wordpress.
And i want to rename images name during upload for my code below
Result like: "MemberUpload_dd/mm/yy_random_number_[width]x[height].jpg"
(For all size: thumbnail, medium, large, full and custom size) My code upload i'm using for my theme..
Thanks friends verymuch! ;)

// Upload 
if (!function_exists('wp_generate_attachment_metadata')){
                    require_once(ABSPATH . "wp-admin" . '/includes/image.php');
                    require_once(ABSPATH . "wp-admin" . '/includes/file.php');
                    require_once(ABSPATH . "wp-admin" . '/includes/media.php');
                 if ($_FILES) {
                    foreach ($_FILES as $file => $array) {
                        if ($_FILES[$file]['error'] !== UPLOAD_ERR_OK) {
                            return "Upload Err: " . $_FILES[$file]['error'];
                        $attach_id = media_handle_upload( $file, $newPost );
                if ($attach_id > 0){
                    //and if you want to set that image as Post  then use:
// END upload
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you can't put slashes in a filename, it is a path separator. see this question for a potential answer. – Milo Jun 14 '13 at 16:39
@Milo : It's not work for me at front-end posting :( It only Work when i'm upload picture in Dashboard. – Zen Nguyễn Jun 14 '13 at 18:25
This post may help you [enter link description here][1] [1]: wordpress.stackexchange.com/q/93995/37854 – usama sulaiman Oct 1 '13 at 16:02

I think You need to Know about using PHP to upload files as well

PHP File Upload

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