Fatal error: Uncaught TypeError: usort(): Argument #2 ($callback) must be a valid callback, function "cmp" not found or invalid function name in /home/tiger56/public_html/author.php:98
Stack trace:
#0 /home/tiger56/public_html/author.php(98): usort(Array, 'cmp')
#1 {main}
thrown in /home/tiger56/public_html/author.php on line 98