[PHP] operators as callbacks?

[Joe]

Is it possible to use a PHP operator as a callback? Suppose I want to add two
arrays elementwise, I want to be able to do something like this:
 array_map('+', $array1, $array2)
but this doesn't work as + is an operator and not a function.

I can use the BC library's math functions instead:
 array_map('bcadd', $array1, $array2)
but that is an ugly hack that might break if the library is not available.

I can create an anonymous function:
 array_map(create_function('$a, $b', 'return $a + $b;'), $array1, $array2)
but that seems really unnecessarily verbose.

Is there any simple clean way to do it? Thanks,



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Re: [PHP] operators as callbacks?

[Nathan Nobbe]

On Sat, Nov 29, 2008 at 2:42 PM, Joe [EMAIL PROTECTED] wrote:

 Is it possible to use a PHP operator as a callback?


not that im aware of, even if you use the operator overloading extension, im
not sure youll find that ability.

I can use the BC library's math functions instead:
  array_map('bcadd', $array1, $array2)
 but that is an ugly hack that might break if the library is not available.


 i dont know how bad that is really, i guess it depends on the distribution
scope of the application.  if its in a controlled environment, id just say
install bcmath and forget it.

I can create an anonymous function:
  array_map(create_function('$a, $b', 'return $a + $b;'), $array1, $array2)
 but that seems really unnecessarily verbose.


well, youll just have to wait for 5.3 and its new lambda notation, youll be
able to do this (something close anyway :)),

array_map(function($a, $b) { return $a + $b; }, $array1, $array2);

it doesnt look like much difference here, but create_function() gets a lot
worse w/ functions any less trivial than adding 2 numbers.

Is there any simple clean way to do it? Thanks,


i think youre beating your head against the wall for no good reason.  your
solutions are fine, just pick one and roll w/ it ;)

-nathan

[PHP] operators

[Henry Krinkle]

 I have some experience with PHP, but not with these operators:

-
= 

Can someone explain how they are working in this snippet from Yahoo's search API

foreach($xml-Result[$i] as $key=$value) 

I don't see anything about them in the Array Operators documentation..

Thanks



-
Yahoo! for Good - Make a difference this year. 

Re: [PHP] operators

[Ligaya Turmelle]

$xml-Result[$i]  - a method call for object $xml
$key=$value  - array notation

Henry Krinkle wrote:

 I have some experience with PHP, but not with these operators:

-
= 


Can someone explain how they are working in this snippet from Yahoo's search API

foreach($xml-Result[$i] as $key=$value) 


I don't see anything about them in the Array Operators documentation..

Thanks



-
Yahoo! for Good - Make a difference this year. 


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[PHP] Operators

[Gerard Samuel]

If != is the opposite of ==
What is the opposite of === ??

Thanks...


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RE: [PHP] Operators

[Johnson, Kirk]

 If != is the opposite of ==
 What is the opposite of === ??

I believe that is !==

Kirk

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