Resize images within the post

  • Hello friends , I have a problem in wordpress I can not solve !
    I need all the images from within the wordpress post are resized to a standard size .

    I tried to create a function to it, the more it seems to me that did not work or is not working .

    I have a function that makes scaling the image to a suitable size , I found this function on github this one and created the following function:

    function resizeThumb($html, $post_id, $post_thumbnail_id, $size, $attr){
$image = get_post_thumbnail_id();
$thumb = vt_resize( $image, '', 850, 600, true );
$html = '<img src="' . $thumb[url] . '" alt="' . $alt . '"';
return $html;
}
add_filter( 'post_thumbnail_html', 'resizeThumb', 10, 5 );

    It is not correct , so I’m asking because I’m learning to “program” WP pair now .

    Could anyone help me with a solution for this?

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