note 126679 added to language.variables.external

Interesting behavior I found while playing with $_GET Using $_GET gives a string , if this string contains an integer, you can still work with it as if it was an integer ( e.g. do addition,multiplication etc). As far as i have tested this behavior it will only work with integer inputs. Here is my example code: <?php /* gets Variables through $_GET and does some arithmetic with them */ $a = $_GET['var1']; $b = $_GET['var2']; $c = $a*$b; $d = $a+$b; $e = sqrt(($a*$a)+($b*$b)); echo ('the multiplication is: ' . $c); echo "<br>"; echo ('the addition is: ' . $d); echo "<br>"; echo ('the pythagorean is :' . $e); echo "<br>"; echo (var_dump($a)); //type of variable is string echo "<br>"; echo (var_dump($b));//type of variable is string ?> /index.php?var1=123&var2=123 ---- Server IP: 45.112.84.4 Probable Submitter: 45.112.85.242 (proxied: 81.223.67.62) ---- Manual Page -- https://php.net/manual/en/language.variables.external.php Edit -- https://main.php.net/note/edit/126679 Del: integrated -- https://main.php.net/note/delete/126679/integrated Del: useless -- https://main.php.net/note/delete/126679/useless Del: bad code -- https://main.php.net/note/delete/126679/bad+code Del: spam -- https://main.php.net/note/delete/126679/spam Del: non-english -- https://main.php.net/note/delete/126679/non-english Del: in docs -- https://main.php.net/note/delete/126679/in+docs Del: other reasons-- https://main.php.net/note/delete/126679 Reject -- https://main.php.net/note/reject/126679 Search -- https://main.php.net/manage/user-notes.php