php - Trying to get property of non-object -

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i want if there no authors/users found exit given message below. keep striking trying property of non-object on $author_found_count. why this? thanks

$find_author = "select user reviews review_id=$review_id;";  $search_author = mysqli_query($con,$find_author);  $found_author = mysqli_fetch_array($search_author);  $author_found_count = $found_author->num_rows;  //check see if reviews have been found. if($author_found_count == 0) {  //no reviews found. exit ("you not author of review. not authorised delete it."); }

you trying num_rows of php array, purpose should use mysqli_result object: 

$author_found_count = $search_author->num_rows;

you can use php function check if result set empty:

$author_found_count = count($found_author);

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