I'm trying to convert a base64 string to an image file and upload it into WordPress media library. It seems like the code is working, but, for some reason, every time I call this function it uploads the same image multiple times.. I wonder what am I doing wrong and what I need to change in order to fix it. This is my code: <?php class Catalog { public function uploadBase64Image() { //Base 64 string example $base64_img = include 'testbase64.php'; $upload_dir = wp_upload_dir(); $upload_path = str_replace('/', DIRECTORY_SEPARATOR, $upload_dir['path']) . DIRECTORY_SEPARATOR; $title = "test"; $image_parts = explode(";base64,",$base64_img); $decoded = base64_decode($image_parts[1]); $mime = substr($base64_img, 11, 4); $mime = str_replace(';', '', $mime); $filename = $title . '.' . $mime; $file_type = 'image/' . $mime; $hashed_filename = md5($filename . microtime()) . '_' . $filename; $upload_file = file_put_contents($upload_path . $hashed_filename, $decoded); $attachment = [ 'post_mime_type' => $file_type, 'post_title' => preg_replace('/\.[^.]+$/', '', basename($hashed_filename)), 'post_content' => '', 'post_status' => 'inherit', 'guid' => $upload_dir['url'] . '/' . basename($hashed_filename) ]; $attach_id = wp_insert_attachment($attachment, $upload_dir['path'] . '/' . $hashed_filename); require_once ABSPATH . 'wp-admin/includes/image.php'; $attach_data = wp_generate_attachment_metadata($attach_id, $upload_dir['path'] . '/' . $hashed_filename); wp_update_attachment_metadata($attach_id, $attach_data); return $attach_id; } I'm including this class using require_once in my theme's functions.php file and using it this way: function testCatalog() { if(!is_admin()) { $catalog = new Catalog(); return $catalog->uploadBase64Image(); } } add_action('init', 'testCatalog'); Any help will be highly appreciated, thanks is advance!