I would like to use Qazy Lazy load and I need to include new data attribute data-qazy="true" inside all img tags. I tried to include with this function, but it only applies for sidebar images and doesn't work for the post images:

function add_lazyload_atts( $atts, $attachment ) {
    if ( ! wp_get_attachment_image_src( $attachment ) ) {
    $atts['data-qazy'] = 'true';
    return $atts;
add_filter( 'wp_get_attachment_image_attributes', 'add_lazyload_atts', 10, 2 );
  • 1
    Try researching the codex before just blatantly asking someone to tell you how to do something and reformat your question with examples of what you have tried, and what has failed. You could have also done a simple search on this site to find a possible solution. wordpress.stackexchange.com/questions/53735/… – Greg McMullen Sep 9 '16 at 23:00
  • I tried this solution but it only applies the newly inserted images. – tw8sw8dw8 Sep 10 '16 at 5:52
  • Your problem is that this function is only in use in the sidebar. Look up what functions you use for the other content you want to lazy load, file and edit, etc. – kaiser Sep 11 '16 at 14:35

I found the solution to add that attribute to the img tag with this function:

function new_content($content) {
    $content = str_replace('<img','<img data-qazy="true"', $content);
    return $content;
  • 1
    Glad that you solved your own question. Please be sure to click the checkmark next to your answer after two days to indicate that your question has been resolved. – Ethan Jinks O'Sullivan Sep 12 '16 at 0:33

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