[WP] Batch update posts

batch.php

$posts = get_posts( array(
  'post_type'    => 'post',
  'numberposts' => -1
) );
 
foreach ( $posts as $post ) {
  
  $content = $post->post_content;
  if(substr( $content, 0, 4 ) === "<img"){
    $content = preg_replace('/<img(.*)>/i','', $content, 1);
    $post_data['ID'] = $post->ID;
    $post_data['post_content'] = $content;
  
    wp_update_post( $post_data );
  }
  
}