templates - how to define a sample avatar in wordpress -


i want show last comments in side bar in wordpress, if person has sent comment has gavatar shown if not have , in template there default picture below : enter image description here

how can cusomize picture ? , show favorite avatar ?

the get_avatar() function has $default parameter, allowing set custom url image specify

<?php echo get_avatar( $id_or_email, $size, $default, $alt ); ?>

https://codex.wordpress.org/function_reference/get_avatar


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