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Best way of iterating over object member fields in PHP?

0 votes
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I came across a bug in some of my code, where I do something like the following:

$obj = new MyObject();

foreach ($obj as $key=>$value)

{    
 echo $key;
}

Note that I don't use $value in the loop - I'm only doing processing based on the field name.

Now my IDE flags this unused variable as a hint, so (on autopilot) I changed it to be

$obj = new MyObject();
foreach (array_keys($obj) as $key)
{
 echo $key;
}

Which removes the hint, and looks like the right sort of thing. Of course this doesn't work: "array_keys() expects parameter 1 to be an array, object found".

So what is the correct way to list the field names of an object?

posted Sep 3, 2014 by anonymous

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Two ways depending on whether you want to get them from the class definition or what the object actually contains:
* http://php.net/get-class-vars
* http://php.net/get-object-vars

1 Answer

+1 vote
 
Best answer

You could use get_object_vars
http://php.net/manual/en/function.get-object-vars.php

So something like the following may work

$obj = new MyObject();
foreach (array_keys(get_object_vars($obj)) as $key)
{
 echo $key;
}
answer Sep 3, 2014 by Sonu Jindal
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I am working on building an api client for the Rakuten Market-place. I have got some test requests for add delete update etc working and thought I should aim to structure it as a Gem and publish it so that others can use it/enhance it.

I haven't built a Gem before (worked mostly within the rails environment to date).

Have been reading and looking at other api client gems and am making progress on building something (still got a way to go to handle errors etc.)

To make the gem general purpose though, I am trying to figure out the best way to provide the mapping between models in a rails app and the api client objects (such as product, category, order etc).

I am aiming to make each client api object a class be (or should i call them models?)
Then I suspect I will use new to build an api instance from a rails instance, and find to return an api instance to a rails instance.

I can build in mapping for my own models to the api objects with no problem, but I can't see how I could generalize this so that other apps with similar models could use the gem.

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