[PHP] How to get the 'return type' of a function?

2010-02-23 Thread Dasn 
Hello guys, I try to use 'ReflectionFunction' to retrieve the info of a  
function.

For example:
?php

$rf = new ReflectionFunction('strstr');
echo $rf;
?
=== output ==

Function [ internal:standard function strstr ] {

  - Parameters [3] {
Parameter #0 [ required $haystack ]
Parameter #1 [ required $needle ]
Parameter #2 [ optional $part ]
  }
}

The problem is there's no 'return type' (i.e. 'string' in this example)
info about the function.

Could you tell me how to retrieve the 'return type'?
Thanks.


--
Dasn


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Re: [PHP] How to get the 'return type' of a function?

2010-02-23 Thread shiplu 
2010/2/23 Dasn d...@lavabit.com:
 Hello guys, I try to use 'ReflectionFunction' to retrieve the info of a
 function.
 For example:
 ?php

 $rf = new ReflectionFunction('strstr');
 echo $rf;
 ?
 === output ==

 Function [ internal:standard function strstr ] {

  - Parameters [3] {
    Parameter #0 [ required $haystack ]
    Parameter #1 [ required $needle ]
    Parameter #2 [ optional $part ]
  }
 }

 The problem is there's no 'return type' (i.e. 'string' in this example)
 info about the function.

 Could you tell me how to retrieve the 'return type'?
 Thanks.
I think PHP doesnt support it.

In ReflectionParameter class you'll see there is no parameter type too.

May be this is because PHP is loosely typed language.

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Re: [PHP] How to get the 'return type' of a function?

2010-02-23 Thread Daniel Egeberg 
2010/2/23 Dasn d...@lavabit.com:
 Hello guys, I try to use 'ReflectionFunction' to retrieve the info of a
 function.
 For example:
 ?php

 $rf = new ReflectionFunction('strstr');
 echo $rf;
 ?
 === output ==

 Function [ internal:standard function strstr ] {

  - Parameters [3] {
    Parameter #0 [ required $haystack ]
    Parameter #1 [ required $needle ]
    Parameter #2 [ optional $part ]
  }
 }

 The problem is there's no 'return type' (i.e. 'string' in this example)
 info about the function.

 Could you tell me how to retrieve the 'return type'?
 Thanks.


 --
 Dasn

That's not possible. Consider this function:

function foo()
{
switch (rand(0, 1)) {
case 0: return 42;
case 1: return 'bar';
}
}

What should the return type be?

-- 
Daniel Egeberg

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Re: [PHP] How to get the 'return type' of a function?

2010-02-23 Thread Bruno Fajardo 
2010/2/23 Daniel Egeberg degeb...@php.net

 2010/2/23 Dasn d...@lavabit.com:
  Hello guys, I try to use 'ReflectionFunction' to retrieve the info of a
  function.
  For example:
  ?php
 
  $rf = new ReflectionFunction('strstr');
  echo $rf;
  ?
  === output ==
 
  Function [ internal:standard function strstr ] {
 
   - Parameters [3] {
     Parameter #0 [ required $haystack ]
     Parameter #1 [ required $needle ]
     Parameter #2 [ optional $part ]
   }
  }
 
  The problem is there's no 'return type' (i.e. 'string' in this example)
  info about the function.
 
  Could you tell me how to retrieve the 'return type'?
  Thanks.
 
 
  --
  Dasn

 That's not possible. Consider this function:

 function foo()
 {
        switch (rand(0, 1)) {
                case 0: return 42;
                case 1: return 'bar';
        }
 }

 What should the return type be?

Mixed? 
http://www.php.net/manual/en/language.pseudo-types.php#language.types.mixed


 --
 Daniel Egeberg

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Re: [PHP] How to get the 'return type' of a function?

2010-02-23 Thread tedd 

At 3:17 PM +0100 2/23/10, Daniel Egeberg wrote:

2010/2/23 Dasn d...@lavabit.com:
  Could you tell me how to retrieve the 'return type'?

 Thanks.


 --
 Dasn


That's not possible. Consider this function:

function foo()
{
switch (rand(0, 1)) {
case 0: return 42;
case 1: return 'bar';
}
}

What should the return type be?

--
Daniel Egeberg



It can be anything you want to test for -- check out:

is_int();
is_nan();
is_float();
is_long();
is_string();

IOW, is_whatever();

Cheers,

tedd

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---
http://sperling.com  http://ancientstones.com  http://earthstones.com

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Re: [PHP] How to get the 'return type' of a function?

2010-02-23 Thread Nathan Rixham 
tedd wrote:
 At 3:17 PM +0100 2/23/10, Daniel Egeberg wrote:
 2010/2/23 Dasn d...@lavabit.com:
   Could you tell me how to retrieve the 'return type'?
  Thanks.


  --
  Dasn

 That's not possible. Consider this function:

 function foo()
 {
 switch (rand(0, 1)) {
 case 0: return 42;
 case 1: return 'bar';
 }
 }

 What should the return type be?

 -- 
 Daniel Egeberg
 
 
 It can be anything you want to test for -- check out:
 
 is_int();
 is_nan();
 is_float();
 is_long();
 is_string();
 
 IOW, is_whatever();
 
 Cheers,
 
 tedd
 

As PHP is loosely typed, the only real way around this is to specify a
return type in a PHPDoc block, then parse that using reflection to get
the @return parameter.

another option is to use something like haXe which is an ECMA style
typed language that compiles to multiple targets, one of which is PHP.

Regards!

Nathan


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Re: [PHP] How to get the 'return type' of a function?

2010-02-23 Thread Ashley Sheridan 
On Tue, 2010-02-23 at 09:31 -0500, tedd wrote:

 At 3:17 PM +0100 2/23/10, Daniel Egeberg wrote:
 2010/2/23 Dasn d...@lavabit.com:
Could you tell me how to retrieve the 'return type'?
   Thanks.
 
 
   --
   Dasn
 
 That's not possible. Consider this function:
 
 function foo()
 {
  switch (rand(0, 1)) {
  case 0: return 42;
  case 1: return 'bar';
  }
 }
 
 What should the return type be?
 
 --
 Daniel Egeberg
 
 
 It can be anything you want to test for -- check out:
 
 is_int();
 is_nan();
 is_float();
 is_long();
 is_string();
 
 IOW, is_whatever();
 
 Cheers,
 
 tedd
 
 -- 
 ---
 http://sperling.com  http://ancientstones.com  http://earthstones.com
 


is_quantum() is pretty useful as well, if you want to see if it's sort
of there and not at the same time. Probably turns into a cat in a box at
some point too, everything quantum has cats in...

Thanks,
Ash
http://www.ashleysheridan.co.uk

Re: [PHP] How to get the 'return type' of a function?

2010-02-23 Thread Kevin Kinsey 

Ashley Sheridan wrote:

is_quantum() is pretty useful as well, if you want to see if it's sort
of there and not at the same time. Probably turns into a cat in a box at
some point too, everything quantum has cats in...

Thanks,
Ash


So, should we add to the list:

is_schrodingers_cat_alive()

??

KDK

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Re: [PHP] How to get the 'return type' of a function?

2010-02-23 Thread Ashley Sheridan 
On Tue, 2010-02-23 at 19:19 -0600, Kevin Kinsey wrote:

 Ashley Sheridan wrote:
  is_quantum() is pretty useful as well, if you want to see if it's sort
  of there and not at the same time. Probably turns into a cat in a box at
  some point too, everything quantum has cats in...
  
  Thanks,
  Ash
 
 So, should we add to the list:
 
 is_schrodingers_cat_alive()
 
 ??
 
 KDK
 


I think PHP would crash trying to return the boolean value from that
one!

Thanks,
Ash
http://www.ashleysheridan.co.uk