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By using the code below, I can create a new post and upload an image to wordpress's upload directory as a attachment through a form's submitted data.

    $new_post = array(
        'post_title' => $title,
        'post_content' => $content,
        'post_status' => 'publish',
        'post_date' => date('Y-m-d H:i:s'),
        'post_author' => $user_ID,
        'post_type' => 'post',
        'post_category' => array(3)
    $post_id = wp_insert_post($new_post);

    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 error : " . $_FILES[$file]['error'];
            $attach_id = media_handle_upload( $file, $post_id );

I want to insert an image to post, not replace the featured image so set_post_thumbnail() function is not appropriate. I found that if I manually insert an image to post, it will generated the HTML code likes:

<a href=""><img class="alignnone size-medium wp-image-136" title="HARP_SH530U_0" src="" alt="" width="300" height="167" /></a>

So which API would provide the function of inserting image to post, likes generating the HTML code above and not replacing the featured image?


share|improve this question
i think what you have to do is generate the neccessary html & append it to the post_content used in wp_insert_post, then use wp_update_post to update the new content – Mridul Aggarwal Oct 18 '12 at 9:03
up vote 3 down vote accepted

You can set the uploaded image as the post thumbnail via,



if ($_FILES) {
    foreach ($_FILES as $file => $array) {
        if ($_FILES[$file]['error'] !== UPLOAD_ERR_OK) {
            return "upload error : " . $_FILES[$file]['error'];
        $attach_id = media_handle_upload( $file, $post_id );


If you are uploading an array of images, then you might wish to specify which image by referencing the key,

$file[0] //for the first image in the array
$file[1] //for the second image in the array
$file[2] //for the third image in the array

...but that should not be necessary when uploading a single image.


Based on your comments, if you want to insert the image at the beggining of or before your post content its probably best you filter the the_content function like so,

add_filter( 'the_content', 'insert_img_to_post', 20 );

function insert_img_to_post( $content ) {

    global $post;
    $post_id = $post->ID;

    if ( is_single() )

        $content = sprintf(
            '<img class="post-icon" src="%s" alt="Post icon" title=""/>',
            wp_get_attachment_url(get_post_meta( $post_id, '_thumbnail_id', true )),

    return $content;

...add this function as a separate function/filter in your functions.php file. Do not try and bundle it within your wp_insert_post function as it will not work. This is intended to run by itself, hooking onto the_content filter, inserting the image at the top of the post before the content, then appending the content beneath it.

This is currently running on a single post page (is_single) if you want it to run on something else, like a page, then change to is_page or any other conditional tag that meets your needs.

share|improve this answer
Thanks for the code, I test that if I use your code, there are none image insert to post; On the other hand, if I put update_post_meta under the line of $attach_id, I will replaced the featured image. – Charles Yeung Oct 18 '12 at 9:14
Yeah, sorry I just re-read, I thought you wanted to set the featured image of the post. But rather, you want to insert the image into the body of the content right? – userabuser Oct 18 '12 at 9:15
Yes, you are right, I want to insert the image into the body of the content. – Charles Yeung Oct 18 '12 at 9:17
Where abouts? The begining, the end or somewhere in the middle (anywhere in the middle, i.e. amongst text). – userabuser Oct 18 '12 at 9:17
I think inserting the image to the begining of the content. Thanks – Charles Yeung Oct 18 '12 at 9:19

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