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March 16, 2007 12:47 pm
- Keeper
- Member
Indicating the type of variables
Where can I read about how to indicate the type of variable which is transmitted to the function, for example
function myFunction(varType $myVar) {
}
Here varType is the type of variable. This works with array and how to indicate other types of variables, for instance, strings, whole number, with floating dot and so on.
Analogically to array I try
public function editClientGetDataFromSQL(integer $id) {
if (!$module->editClientGetDataFromSQL((int)$uriParams["client"])) ...
Returns error:
Catchable fatal error: Argument 1 passed to clients::editClientGetDataFromSQL() must be an instance of integer, integer given, called in D:\Web\www\portal.localhost\htdocs\modules\clients\admin.php on line 45 and defined in D:\Web\www\portal.localhost\htdocs\modules\clients\__classes.php on line 1
At the same time construction
public function editClientGetDataFromSQL(array $id) {
if (!$module->editClientGetDataFromSQL(array($uriParams["client"]))) ...
works correctly
PHP 5.2.1
WIN XP
March 16, 2007 12:52 pm
- sam43inwood
- Member
Re: Indicating the type of variables
Who told you that it is possible even with array or someObject?? Where is it written? Could you send me a link to the manual, please!
March 16, 2007 12:55 pm
March 16, 2007 1:00 pm
- Keeper
- Member
Re: Indicating the type of variables
Thanks. I have been searching but I couldn’t find anything for a long time.
I was totally disappointed with
Traditional type hinting with int and string isn't supported.
Who knows if support for int, float, string is planned?
As for me, from the code’s security point of view it would be good to indicate type of the variable which we are expecting in the function (for example, for the very unique ID which is integer) especially when the work is done within team and someone has forgotten to reduce the type and if we indicate in the function it will result into fatal error.
March 16, 2007 1:03 pm
- jjjlc1983
- Member
Re: Indicating the type of variables
if we indicate in the function it will result into fatal error.
Isn’t it too strict?
So semantics of 7 and "7" in PHP is nearly equal.
If you like it or not – that is a separate question but the fact remains.
And making everyone always write $obj->method((int) $id, (bool) $flag) isn’t good either.
When you need reduction of the type it should be declared in the function itself.
P.S. By the way, realization of some checkFuncArgs('lsb'); is rather simple.
March 16, 2007 1:16 pm
- Keeper
- Member
Re: Indicating the type of variables
jjjlc1983
Nearly in all programming languages beginning from quick basic 88 the ability to indicate the type of variable is introduced (in some languages it is necessary).
Isn’t it too strict?
What do you mean with ‘strict’? Indicating the type of variable we need?
On the other hand, for instance, 5 persons take part in the software development in PHP. Each of them is occupied with development of definite classes, modules and so on.
Finally they will be composed into one big product. I.e. the whole work will be handed over to one or two web-programmers who will need to bring this all together.
You should agree that everyone writes in ‘his own style’, can make errors or will hope that the data will be checked in the main module of this software or by someone in advance or forgets about types reducing at all relying on that ‘semantics of 7 and "7" in PHP is nearly equal’ or something else…
(7 and "7" are equal at first sight but they are different inside and so the product can be broken and all the work will be ‘vain’ because of one type that hasn’t been reduced).
Last edited by Keeper (March 16, 2007 1:17 pm)
March 16, 2007 1:23 pm
- biopd42
- Member
Re: Indicating the type of variables
Keeper, your ponderings are rather theoretical…PHP is a language without strict typification. If you need types, you are to use Java or Python. 
March 16, 2007 1:27 pm
- jjjlc1983
- Member
Re: Indicating the type of variables
and so the product can be broken down
Give an example.
Error may have different consequences. I would even say that for each error it’s possible to develop such a code in which it will be fatal.
or will hope that the data will be checked in the main module
Sure, security (and to tell more precisely – correctness) should be provided beginning from the lowest level.
March 16, 2007 1:30 pm
- purplebean
- Member
Re: Indicating the type of variables
Keeper, you are to use С/C++ but if you aren’t skilled enough, typification won’t help you. It’s enough to reduce variables to necessary types and check them.
If you add types to PHP you will be about to get C.
March 16, 2007 1:34 pm
- sirburpsalot
- Member
Re: Indicating the type of variables
Keeper, your ponderings are rather theoretical…PHP is a language without strict typification. If you need types, you are to use Java or Python.
As I can see, you are also fond of theory.
If you mean static typification, Python has the dynamic one
March 16, 2007 1:38 pm
- biopd42
- Member
Re: Indicating the type of variables
sirburpsalot, why are you talking about dynamic typification?
March 16, 2007 2:00 pm
- sirburpsalot
- Member
Re: Indicating the type of variables
What do mean when talking about ‘strict typification’?
March 16, 2007 2:03 pm
- Keeper
- Member
Re: Indicating the type of variables
I didn’t speak about obligation, just about ability.
If you’ve made array and someObj why don’t you make int, string?
If someone needs it he will use it.
