<?php $result = "$a + $b + $c";
Standard input is empty
string(21) "Array + Array + Array"
PHP Notice: Array to string conversion in /home/yXqls6/prog.php on line 7 PHP Notice: Array to string conversion in /home/yXqls6/prog.php on line 7 PHP Notice: Array to string conversion in /home/yXqls6/prog.php on line 7