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PHP5: hook cast_object handler in userspace

php.internals

Cristiano Duarte

23 years ago

Hi internals,

Is there a way to hook the cast_object handler in userspace ? What I want is
a default "to_string" method called when I do something like:

class my_object extends class_with_default_to_string_method {
private $value = "Hello";
public function to_string() { //overhiding default to_string wich prints
"Object id #n"
return $this->value;
}
}

$o = new my_object();
echo $o;

or:

$o = new xxx();
echo "My stringfied value is=$o";

Thanx,

Cristiano Duarte

Cristiano Duarte

23 years ago

Sorry guys,

> $o = new xxx();

should be $o = new my_object();

And if there is a way to hook into zend_standard_class (stdClass) what would
make all objects inherit the to_string method, it would be great !

Cristiano Duarte

"Cristiano Duarte" <cunha17@uol.com.br> escreveu na mensagem
news:20030802224959.58552.qmail@pb1.pair.com...

> Hi internals,
>
> Is there a way to hook the cast_object handler in userspace ? What I want

is

> a default "to_string" method called when I do something like:
>
> class my_object extends class_with_default_to_string_method {
>     private $value = "Hello";
>     public function to_string() { //overhiding default to_string wich

prints

Cristiano Duarte

23 years ago

I made a patch to the latest PHP5-CVS wich implements this hook. I think
it's useful to make a meaningful object stringfied value.

Can anyone verify it and maybe commit it to CVS ?

--- zend.c 2003-07-30 14:07:36.000000000 -0300
+++ zend.c.new 2003-08-03 00:27:43.000000000 -0300
@@ -227,10 +227,24 @@
if (expr->value.obj.handlers->cast_object) {
TSRMLS_FETCH();
expr->value.obj.handlers->cast_object(expr, expr_copy, IS_STRING, 0
TSRMLS_CC);
} else {
-    expr_copy->value.str.val = (char *) emalloc(sizeof("Object id #")-1 +
MAX_LENGTH_OF_LONG);
-    expr_copy->value.str.len = sprintf(expr_copy->value.str.val, "Object id
#%ld", (long)expr->value.obj.handle);
+      //call to_string method
+      zval *fname, *retval;
+      MAKE_STD_ZVAL(fname);
+      ZVAL_STRING(fname, "to_string", 1);
+      TSRMLS_FETCH();
+      if (call_user_function_ex(NULL, &expr, fname, &retval, 0, NULL, 0,
NULL TSRMLS_CC) == SUCCESS) {
+         if (Z_TYPE_P(retval) != IS_STRING) {
+     convert_to_string(retval);
+         }
+         ZVAL_STRINGL(expr_copy, Z_STRVAL_P(retval), Z_STRLEN_P(retval),
1);
+         zval_ptr_dtor(&retval);
+      } else {
+                                     Z_STRVAL_P(expr_copy) = (char *)
emalloc(sizeof("Object id #")-1 + MAX_LENGTH_OF_LONG);
+                                     Z_STRLEN_P(expr_copy) =
sprintf(Z_STRVAL_P(expr_copy), "Object id #%ld",
(long)Z_OBJ_HANDLE_P(expr));
+      }
+      zval_ptr_dtor(&fname);
}
#if 0
/* FIXME: This might break BC for some people */
expr_copy->value.str.len = sizeof("Object")-1;


Thanx,

Cristiano Duarte.

"Cristiano Duarte" <cunha17@uol.com.br> escreveu na mensagem
news:20030802230007.65232.qmail@pb1.pair.com...

> Sorry guys,
>
> > $o = new xxx();
> should be $o = new my_object();
>
> And if there is a way to hook into zend_standard_class (stdClass) what

would

> make all objects inherit the to_string method, it would be great !
>
> Cristiano Duarte
>
> "Cristiano Duarte" <cunha17@uol.com.br> escreveu na mensagem
> news:20030802224959.58552.qmail@pb1.pair.com...
> > Hi internals,
> >
> > Is there a way to hook the cast_object handler in userspace ? What I

want

(Marcus Börger)

23 years ago

Hello Cristiano,

Sunday, August 3, 2003, 5:33:25 AM, you wrote:

CD> I made a patch to the latest PHP5-CVS wich implements this hook. I think
CD> it's useful to make a meaningful object stringfied value.

CD> Can anyone verify it and maybe commit it to CVS ?

CD> --- zend.c 2003-07-30 14:07:36.000000000 -0300
CD> +++ zend.c.new 2003-08-03 00:27:43.000000000 -0300
CD> @@ -227,10 +227,24 @@
CD>     if (expr->value.obj.handlers->cast_object) {
CD>      TSRMLS_FETCH();
CD>      expr->value.obj.handlers->cast_object(expr, expr_copy, IS_STRING, 0
CD> TSRMLS_CC);
CD>     } else {
-    expr_copy->>value.str.val = (char *) emalloc(sizeof("Object id #")-1 +
CD> MAX_LENGTH_OF_LONG);
-    expr_copy->>value.str.len = sprintf(expr_copy->value.str.val, "Object id
#%ld", (long)expr->>value.obj.handle);
CD> +      //call to_string method
CD> +      zval *fname, *retval;
CD> +      MAKE_STD_ZVAL(fname);
CD> +      ZVAL_STRING(fname, "to_string", 1);
CD> +      TSRMLS_FETCH();
CD> +      if (call_user_function_ex(NULL, &expr, fname, &retval, 0, NULL, 0,
CD> NULL TSRMLS_CC) == SUCCESS) {
CD> +         if (Z_TYPE_P(retval) != IS_STRING) {
CD> +     convert_to_string(retval);
CD> +         }
CD> +         ZVAL_STRINGL(expr_copy, Z_STRVAL_P(retval), Z_STRLEN_P(retval),
CD> 1);
CD> +         zval_ptr_dtor(&retval);
CD> +      } else {
CD> +                                     Z_STRVAL_P(expr_copy) = (char *)
CD> emalloc(sizeof("Object id #")-1 + MAX_LENGTH_OF_LONG);
CD> +                                     Z_STRLEN_P(expr_copy) =
CD> sprintf(Z_STRVAL_P(expr_copy), "Object id #%ld",
CD> (long)Z_OBJ_HANDLE_P(expr));
CD> +      }
CD> +      zval_ptr_dtor(&fname);
CD>     }
CD>  #if 0
CD>     /* FIXME: This might break BC for some people */
CD>     expr_copy->value.str.len = sizeof("Object")-1;


CD> Thanx,

CD> Cristiano Duarte.

CD> "Cristiano Duarte" <cunha17@uol.com.br> escreveu na mensagem
CD> news:20030802230007.65232.qmail@pb1.pair.com...

>> Sorry guys,
>>
>> > $o = new xxx();
>> should be $o = new my_object();
>>
>> And if there is a way to hook into zend_standard_class (stdClass) what

CD> would

>> make all objects inherit the to_string method, it would be great !
>>
>> Cristiano Duarte
>>
>> "Cristiano Duarte" <cunha17@uol.com.br> escreveu na mensagem
>> news:20030802224959.58552.qmail@pb1.pair.com...
>> > Hi internals,
>> >
>> > Is there a way to hook the cast_object handler in userspace ? What I

CD> want

>> is
>> > a default "to_string" method called when I do something like:
>> >
>> > class my_object extends class_with_default_to_string_method {
>> >     private $value = "Hello";
>> >     public function to_string() { //overhiding default to_string wich
>> prints
>> > "Object id #n"
>> >         return $this->value;
>> >     }
>> > }
>> >
>> > $o = new my_object();
>> > echo $o;
>> >
>> > or:
>> >
>> > $o = new xxx();
>> > echo "My stringfied value is=$o";
>> >
>> > Thanx,
>> >
>> > Cristiano Duarte
>> >
>> >
>>
>>

The patch doesn't compile (always use confugure --enable-maintainer-zts).
Then you assume that every class has a function to_string(), this is not what
we want.

--
Best regards,
Marcus                            mailto:helly@php.net

Sterling Hughes

23 years ago

So, being the author of the C-level cast_object(), I thought about
exposing this at one time.  I decided against it mainly because I needed
it for simplexml, and I didn't want an internals decision to be clouded
by userspace discussions (how's my whitespace btw?)

I really like the idea of PHP having an object interface that is
completely transparent.  It would be really nice if the language could
(preferably via interfaces), provide a way for userspace people to
design classes and objects that behave like base types.

Is this a bit magical?  Yes.
But its also the only reason I'd ever use objects.

If I need something to map to an external datasource, or an abstract
data type, objects are the most powerful container.  They allow for more
efficiency (fewer function calls), and a more elegant userspace
interface.   I think it would be really great if the PHP object model
contained all the necessary hooks so that something like simplexml could
be implemented in userspace.

-Sterling

Am Son, 2003-08-03 um 04.59 schrieb Marcus Börger:

> Hello Cristiano,
>
> Sunday, August 3, 2003, 5:33:25 AM, you wrote:
>
> CD> I made a patch to the latest PHP5-CVS wich implements this hook. I think
> CD> it's useful to make a meaningful object stringfied value.
>
> CD> Can anyone verify it and maybe commit it to CVS ?
>
> CD> --- zend.c 2003-07-30 14:07:36.000000000 -0300
> CD> +++ zend.c.new 2003-08-03 00:27:43.000000000 -0300
> CD> @@ -227,10 +227,24 @@
> CD>     if (expr->value.obj.handlers->cast_object) {
> CD>      TSRMLS_FETCH();
> CD>      expr->value.obj.handlers->cast_object(expr, expr_copy, IS_STRING, 0
> CD> TSRMLS_CC);
> CD>     } else {
> -    expr_copy->>value.str.val = (char *) emalloc(sizeof("Object id #")-1 +
> CD> MAX_LENGTH_OF_LONG);
> -    expr_copy->>value.str.len = sprintf(expr_copy->value.str.val, "Object id
> #%ld", (long)expr->>value.obj.handle);
> CD> +      //call to_string method
> CD> +      zval *fname, *retval;
> CD> +      MAKE_STD_ZVAL(fname);
> CD> +      ZVAL_STRING(fname, "to_string", 1);
> CD> +      TSRMLS_FETCH();
> CD> +      if (call_user_function_ex(NULL, &expr, fname, &retval, 0, NULL, 0,
> CD> NULL TSRMLS_CC) == SUCCESS) {
> CD> +         if (Z_TYPE_P(retval) != IS_STRING) {
> CD> +     convert_to_string(retval);
> CD> +         }
> CD> +         ZVAL_STRINGL(expr_copy, Z_STRVAL_P(retval), Z_STRLEN_P(retval),
> CD> 1);
> CD> +         zval_ptr_dtor(&retval);
> CD> +      } else {
> CD> +                                     Z_STRVAL_P(expr_copy) = (char *)
> CD> emalloc(sizeof("Object id #")-1 + MAX_LENGTH_OF_LONG);
> CD> +                                     Z_STRLEN_P(expr_copy) =
> CD> sprintf(Z_STRVAL_P(expr_copy), "Object id #%ld",
> CD> (long)Z_OBJ_HANDLE_P(expr));
> CD> +      }
> CD> +      zval_ptr_dtor(&fname);
> CD>     }
> CD>  #if 0
> CD>     /* FIXME: This might break BC for some people */
> CD>     expr_copy->value.str.len = sizeof("Object")-1;
>
>
> CD> Thanx,
>
> CD> Cristiano Duarte.
>
> CD> "Cristiano Duarte" <cunha17@uol.com.br> escreveu na mensagem
> CD> news:20030802230007.65232.qmail@pb1.pair.com...
> >> Sorry guys,
> >>
> >> > $o = new xxx();
> >> should be $o = new my_object();
> >>
> >> And if there is a way to hook into zend_standard_class (stdClass) what
> CD> would
> >> make all objects inherit the to_string method, it would be great !
> >>
> >> Cristiano Duarte
> >>
> >> "Cristiano Duarte" <cunha17@uol.com.br> escreveu na mensagem
> >> news:20030802224959.58552.qmail@pb1.pair.com...
> >> > Hi internals,
> >> >
> >> > Is there a way to hook the cast_object handler in userspace ? What I
> CD> want
> >> is
> >> > a default "to_string" method called when I do something like:
> >> >
> >> > class my_object extends class_with_default_to_string_method {
> >> >     private $value = "Hello";
> >> >     public function to_string() { //overhiding default to_string wich
> >> prints
> >> > "Object id #n"
> >> >         return $this->value;
> >> >     }
> >> > }
> >> >
> >> > $o = new my_object();
> >> > echo $o;
> >> >
> >> > or:
> >> >
> >> > $o = new xxx();
> >> > echo "My stringfied value is=$o";
> >> >
> >> > Thanx,
> >> >
> >> > Cristiano Duarte
> >> >
> >> >
> >>
> >>
>
>
>
>
> The patch doesn't compile (always use confugure --enable-maintainer-zts).
> Then you assume that every class has a function to_string(), this is not what
> we want.
>
> --
> Best regards,
>  Marcus                            mailto:helly@php.net

--
UNIX was not designed to stop you from doing stupid things, because that
would also stop you from doing clever things.
- Doug Gwyn

Cristiano Duarte

23 years ago

>"Marcus BöRger" <marcus.boerger@t-online.de> escreveu na mensagem

news:13610291366.20030803105909@post.rwth-aachen.de...

>
> The patch doesn't compile (always use confugure --enable-maintainer-zts).
> Then you assume that every class has a function to_string(), this is not

what

> we want.
>
> --
> Best regards,
>  Marcus                            mailto:helly@php.net
>

Marcus,

1. I tried to learn how ZE2 works in 5 hours to write this patch... Sorry. I
even didn't know how ZE1 works...
2. First I tried with get_method handler but then I didn't know how to call
the method with the resulting zend_function union. So I decided to use
"call_user_function" directly since if the method doesn't exist FALSE will
be returned and the default operation will be done. The __destruct method
works the same way...
3. Classes that don't implement the to_string() method will have the default
PHP behavior. They don't need to implement to_string(). The __destruct
method works the same way...
4.I compiled it with --enable-maintainer-zts and it worked. It compiles with
or without --enable-maintainer-zts.

I'm using PHP5-200308030330, with the CLI sapi, and now the configure line
is:
./configure --enable-debug --enable-maintainer-zts --enable-cli

Best regards,

Cristiano Duarte

PS: the patch file needs to be applied inside ./Zend

> Hello Cristiano,
>
> Sunday, August 3, 2003, 5:33:25 AM, you wrote:
>
> CD> I made a patch to the latest PHP5-CVS wich implements this hook. I

think

> CD> it's useful to make a meaningful object stringfied value.
>
> CD> Can anyone verify it and maybe commit it to CVS ?
>
> CD> --- zend.c 2003-07-30 14:07:36.000000000 -0300
> CD> +++ zend.c.new 2003-08-03 00:27:43.000000000 -0300
> CD> @@ -227,10 +227,24 @@
> CD>     if (expr->value.obj.handlers->cast_object) {
> CD>      TSRMLS_FETCH();
> CD>      expr->value.obj.handlers->cast_object(expr, expr_copy, IS_STRING,

0

> CD> TSRMLS_CC);
> CD>     } else {
> -    expr_copy->>value.str.val = (char *) emalloc(sizeof("Object id #")-1

+

> CD> MAX_LENGTH_OF_LONG);
> -    expr_copy->>value.str.len = sprintf(expr_copy->value.str.val, "Object

id

> #%ld", (long)expr->>value.obj.handle);
> CD> +      //call to_string method
> CD> +      zval *fname, *retval;
> CD> +      MAKE_STD_ZVAL(fname);
> CD> +      ZVAL_STRING(fname, "to_string", 1);
> CD> +      TSRMLS_FETCH();
> CD> +      if (call_user_function_ex(NULL, &expr, fname, &retval, 0, NULL,

0,

> CD> NULL TSRMLS_CC) == SUCCESS) {
> CD> +         if (Z_TYPE_P(retval) != IS_STRING) {
> CD> +     convert_to_string(retval);
> CD> +         }
> CD> +         ZVAL_STRINGL(expr_copy, Z_STRVAL_P(retval),

Z_STRLEN_P(retval),

Cristiano Duarte

23 years ago

I read README.SUBMITING_PATCH and attached the patch as specified.

Cristiano Duarte

"Cristiano Duarte" <cunha17@uol.com.br> escreveu na mensagem
news:20030803144736.43225.qmail@pb1.pair.com...

> >"Marcus BöRger" <marcus.boerger@t-online.de> escreveu na mensagem
> news:13610291366.20030803105909@post.rwth-aachen.de...
> >
> > The patch doesn't compile (always use

confugure --enable-maintainer-zts).

> > Then you assume that every class has a function to_string(), this is not
> what
> > we want.
> >
> > --
> > Best regards,
> >  Marcus                            mailto:helly@php.net
> >
>
> Marcus,
>
> 1. I tried to learn how ZE2 works in 5 hours to write this patch... Sorry.

I

> even didn't know how ZE1 works...
> 2. First I tried with get_method handler but then I didn't know how to

call

> the method with the resulting zend_function union. So I decided to use
> "call_user_function" directly since if the method doesn't exist FALSE will
> be returned and the default operation will be done. The __destruct method
> works the same way...
> 3. Classes that don't implement the to_string() method will have the

default

> PHP behavior. They don't need to implement to_string(). The __destruct
> method works the same way...
> 4.I compiled it with --enable-maintainer-zts and it worked. It compiles

with

> or without --enable-maintainer-zts.
>
> I'm using PHP5-200308030330, with the CLI sapi, and now the configure line
> is:
> ./configure --enable-debug --enable-maintainer-zts --enable-cli
>
> Best regards,
>
> Cristiano Duarte
>
> PS: the patch file needs to be applied inside ./Zend
>
>
> > Hello Cristiano,
> >
> > Sunday, August 3, 2003, 5:33:25 AM, you wrote:
> >
> > CD> I made a patch to the latest PHP5-CVS wich implements this hook. I
> think
> > CD> it's useful to make a meaningful object stringfied value.
> >
> > CD> Can anyone verify it and maybe commit it to CVS ?
> >
> > CD> --- zend.c 2003-07-30 14:07:36.000000000 -0300
> > CD> +++ zend.c.new 2003-08-03 00:27:43.000000000 -0300
> > CD> @@ -227,10 +227,24 @@
> > CD>     if (expr->value.obj.handlers->cast_object) {
> > CD>      TSRMLS_FETCH();
> > CD>      expr->value.obj.handlers->cast_object(expr, expr_copy,

IS_STRING,

> 0
> > CD> TSRMLS_CC);
> > CD>     } else {
> > -    expr_copy->>value.str.val = (char *) emalloc(sizeof("Object id

#")-1

> +
> > CD> MAX_LENGTH_OF_LONG);
> > -    expr_copy->>value.str.len = sprintf(expr_copy->value.str.val,

"Object

> id
> > #%ld", (long)expr->>value.obj.handle);
> > CD> +      //call to_string method
> > CD> +      zval *fname, *retval;
> > CD> +      MAKE_STD_ZVAL(fname);
> > CD> +      ZVAL_STRING(fname, "to_string", 1);
> > CD> +      TSRMLS_FETCH();
> > CD> +      if (call_user_function_ex(NULL, &expr, fname, &retval, 0,

NULL,

> 0,
> > CD> NULL TSRMLS_CC) == SUCCESS) {
> > CD> +         if (Z_TYPE_P(retval) != IS_STRING) {
> > CD> +     convert_to_string(retval);
> > CD> +         }
> > CD> +         ZVAL_STRINGL(expr_copy, Z_STRVAL_P(retval),
> Z_STRLEN_P(retval),
> > CD> 1);
> > CD> +         zval_ptr_dtor(&retval);
> > CD> +      } else {
> > CD> +                                     Z_STRVAL_P(expr_copy) = (char

*)

> > CD> emalloc(sizeof("Object id #")-1 + MAX_LENGTH_OF_LONG);
> > CD> +                                     Z_STRLEN_P(expr_copy) =
> > CD> sprintf(Z_STRVAL_P(expr_copy), "Object id #%ld",
> > CD> (long)Z_OBJ_HANDLE_P(expr));
> > CD> +      }
> > CD> +      zval_ptr_dtor(&fname);
> > CD>     }
> > CD>  #if 0
> > CD>     /* FIXME: This might break BC for some people */
> > CD>     expr_copy->value.str.len = sizeof("Object")-1;
> >
> >
> > CD> Thanx,
> >
> > CD> Cristiano Duarte.
> >
> > CD> "Cristiano Duarte" <cunha17@uol.com.br> escreveu na mensagem
> > CD> news:20030802230007.65232.qmail@pb1.pair.com...
> > >> Sorry guys,
> > >>
> > >> > $o = new xxx();
> > >> should be $o = new my_object();
> > >>
> > >> And if there is a way to hook into zend_standard_class (stdClass)

what

> > CD> would
> > >> make all objects inherit the to_string method, it would be great !
> > >>
> > >> Cristiano Duarte
> > >>
> > >> "Cristiano Duarte" <cunha17@uol.com.br> escreveu na mensagem
> > >> news:20030802224959.58552.qmail@pb1.pair.com...
> > >> > Hi internals,
> > >> >
> > >> > Is there a way to hook the cast_object handler in userspace ? What

I

> > CD> want
> > >> is
> > >> > a default "to_string" method called when I do something like:
> > >> >
> > >> > class my_object extends class_with_default_to_string_method {
> > >> >     private $value = "Hello";
> > >> >     public function to_string() { //overhiding default to_string

wich

(Marcus Börger)

23 years ago

Hello Cristiano,

Sunday, August 3, 2003, 9:54:55 PM, you wrote:

CD> I read README.SUBMITING_PATCH and attached the patch as specified.

Not good enough it seems :-(

Some comments:
- Please always start with tabs, you used spaces to begin lines.
- TSRMLS_FETCH() is a variable declaration, so it cannot be used inside a
function.
- Still you haven't checked whether or not the function to_string() is
available.

--
Best regards,
Marcus                            mailto:helly@php.net

Cristiano Duarte

23 years ago

Hi Marcus,

> Not good enough it seems :-(

I'll get there... ;-)

> Some comments:
> - Please always start with tabs, you used spaces to begin lines.

done.

> - TSRMLS_FETCH() is a variable declaration, so it cannot be used inside a
>   function.

If I wipe TSRMLS_FETCH() out, I get this error:
/usr/src/zend2/php-src/Zend/zend.c:234: `tsrm_ls' undeclared (first use in
this function)
So I kept it.

> - Still you haven't checked whether or not the function to_string() is
>   available.

I checked it with get_method, but I don't know how to call a function
(internal, user or overloaded) using the zend_function union.
So I check with "get_method" but still call with "call_user_function" when
the union has the type=ZEND_USER_FUNCTION.
I don't know what to do if type=ZEND_INTERNAL_FUNCTION or
type=ZEND_OVERLOADED_FUNCTION, so I just do the default behavior.
Plz, if you could help on this...

Attached another patch.

Cristiano Duarte

"Marcus BöRger" <marcus.boerger@t-online.de> escreveu na mensagem
news:1639357698.20030803225953@post.rwth-aachen.de...

(Marcus Börger)

23 years ago

Hello Cristiano,

Monday, August 4, 2003, 12:10:26 AM, you wrote:

CD> Hi Marcus,

>> Not good enough it seems :-(

CD> I'll get there... ;-)

>> Some comments:
>> - Please always start with tabs, you used spaces to begin lines.

CD> done.

seems like :-)

>> - TSRMLS_FETCH() is a variable declaration, so it cannot be used inside a
>>   function.

CD> If I wipe TSRMLS_FETCH() out, I get this error:
CD> /usr/src/zend2/php-src/Zend/zend.c:234: `tsrm_ls' undeclared (first use in
CD> this function)
CD> So I kept it.

sure, and now you used it corretly.

>> - Still you haven't checked whether or not the function to_string() is
>>   available.

CD> I checked it with get_method, but I don't know how to call a function
CD> (internal, user or overloaded) using the zend_function union.
CD> So I check with "get_method" but still call with "call_user_function" when
CD> the union has the type=ZEND_USER_FUNCTION.
CD> I don't know what to do if type=ZEND_INTERNAL_FUNCTION or
CD> type=ZEND_OVERLOADED_FUNCTION, so I just do the default behavior.
CD> Plz, if you could help on this...

They are simply other types of function just don't care call_user_function_ex()
will take care of the differences. In other words you won't need swicth/case.

--
Best regards,
Marcus                            mailto:helly@php.net

Cristiano Duarte

23 years ago

"Marcus BöRger" <marcus.boerger@t-online.de> escreveu na mensagem
news:761875207.20030804001846@post.rwth-aachen.de...

> They are simply other types of function just don't care

call_user_function_ex()

> will take care of the differences. In other words you won't need

swicth/case.

switch/case removed and patch attached. Is it ok?
Should the method be named "to_string()", "tostring()" or "__tostring()" ?
Do you commit it to CVS ?

Cristiano Duarte