Update ACF field value when a post is created or updated

This code snippet uses save_post WordPress hook to update ACF field value when a post is created or updated. You can also perform other action using custom functions in this hook.

//Update ACf field on post creation or updation
add_action( 'save_post', 'update_acf_field_value' );
function update_acf_field_value(){
    $fieldValue = 'Example Field Value';
    update_field('field_key_here',$fieldValue);
}