Орхан Гасанлы

$selector = array(
    "post_type"    => "page",
    "hierarchical" => 0,
  "meta_query" => array(
    array(
      "key" => "Ступени, кол-во",
      "value" => "1",
    )
  )
);

function process_pdf( $file ) {

    if( $file['type'] === 'application/pdf' ) {

        // Get the parent post ID, if there is one
        if( isset($_REQUEST['post_id']) ) {
            $post_id = $_REQUEST['post_id'];

            $filename = $file[ 'name' ];
            $filename_wo_extension = basename( $filename, ".pdf" );

            $im = new Imagick();
            $im->setResolution(300, 300);
            $im->readimage( $file[ 'tmp_name' ] ); 
            $pages = $im->getNumberImages();

            $attachments_array = array();

            // iterate over pages of the pdf file
            for($p = 1; $p <= $pages; $p++){
                $im->setIteratorIndex( $p - 1 );
                $im->setImageFormat('jpeg');

                $filename_neu = $filename_wo_extension .'_'. $p .'.jpg';

                // upload new image to wordpress
                // https://codex.wordpress.org/Function_Reference/wp_insert_attachment
                $upload_file = wp_upload_bits($filename_neu, null, $im);
                if (!$upload_file['error']) {

                    $attachment = array(
                        'post_mime_type' => 'image/jpeg',
                        'post_title' => preg_replace( '/\.[^.]+$/', '', $filename_neu),
                        'post_content' => '',
                        'post_status' => 'inherit'
                    );

                    $attachment_id = wp_insert_attachment( $attachment, $upload_file['file'] );

                    if (!is_wp_error( $attachment_id )) {
                        require_once(ABSPATH . "wp-admin" . '/includes/image.php');
                        $attachment_data = wp_generate_attachment_metadata( $attachment_id, $upload_file['file'] );
                        wp_update_attachment_metadata( $attachment_id,  $attachment_data );
                        $attachments_array[] = $attachment_id;
                    }
                }
            }

            // add new images to a gallery (advanced custom fields plugin)
            // http://www.advancedcustomfields.com/resources/update_field/
            update_field( 'field_55b0a473da995', $attachments_array, $post_id );

          $im->destroy();
       }
    }

    return $file;

}

add_filter('wp_handle_upload_prefilter', 'process_pdf' );

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