validation - Is it possible to force your PHP input variables to be strong typed -

when started off php, happy how php loosely typed , how easy learn. grew it, realized being loosely typed complicated scripts rather simplifying them. , looking ways strong type php variables, input variables ($_post, $_get, $_cookie, $_request , $_server vars).

also, validation , sanitizing hidden away in process can "forget" sql injection , many of other error prone validation processes. have rough sketch of how want be.

first declare variable. preferably in oop

$varclass->post->variable_name->type('str', 'sql', 'email');    // or array   $_my_post['variable_name'] = array('str', 'sql', 'emiail'); 

now possibly drop undeclared variable predefined php globals , use variable type validate , sanitize them directly in global arrays.
set values of unvalidated variables emaill bool false , un-submitted null , use them during data validation. however, before went off , re-invented wheel hoping:

some 1 might direct me library helps solve issues?
if there reasons why shouldn't pursue on wild fantasy? better , more clear ways of achieving this?
, other general thoughts may have idea?

http://sourceforge.net/p/php7framework/wiki/input/

wraps superglobals per default, instantiate local objects $postfilter = new input($_post). it's supposed used manually this:

 $_post->email->sql["variable_name"]  $_post->array->int["order_list"] 

and complains if sees $_post["raw"] access.

but can pre-define filter lists. centrally in class-definition. supposed add-on old applications, don't want manually go through code , rewrite strings enforce data formats or types:

 var $__rules = array(       "variable_name" => "email,sql",       "order_id" => "int,range:0:500",       "order_list" => "array,int",  ); 

but avoid ->sql escaping prematurely. if available pdo , parameterized sql should used. of course central escaping feature anyway better cautiosness.

also can define custom filters. picks global functions example.