PHP Object array access with variable

Question

I have a sample object array as a variable $xmlobj

Now when I want to access e.g. price i do it like this:

$product_total_price = $xmlobj->Products->Product->Offer->Price->TotalPrice;

And it's OK - I get what I want, but I am having issue when I want "dynamically" to change what I am looking for like:

$search_part = "Products->Product->Offer->Price->TotalPrice";
$product_total_price = $xmlobj->$search_part;

I obviously get nothing... even when I try:

$product_total_price = $xmlobj."->".$search_part;

So my question is... how to do it ? :)

Thanks !

Why would you do that? It's not dynamic if you have to type "Products->Product->Offer->Price->TotalPrice" anyway. Maybe give more about how/why you want to do this. — AbraCadaver
– AbraCadaver, Commented Apr 26, 2019 at 14:43
I will have different searches through array and I want function to return search based on input... So search_part can be as well $search_part = Products->Product->Offer->Price->attributes()->currency; The point is that $search_part will be changed.... dynamically Anyway - is there a way to do it ? :) — Peter
– Peter, Commented Apr 26, 2019 at 14:46

blupointmedia · Accepted Answer · 2019-04-26 18:03:31Z

2

You will have to construct the path by exploding into an array, then looping to get each property.

For example...

$searchPart = "Products->Product->Offer->Price->TotalPrice";
$searchPath = explode('->', $searchPart);

$current = $xmlobj;
foreach ($searchPath as $segment) {
    $current = $current->$segment;
}
var_dump($current);

or you can convert it to an array and then you will be able to get your attributes

$xml = simplexml_load_string($xmlobj);
$json = json_encode($xml);
$arr = json_decode($json,TRUE);

$parseString = 'Products->Product->Offer->Price->@attributes->currency';
$parsePath = explode('->', $parseString);

$current = $arr;
foreach ($parsePath as $segment) {
    $current = $current[$segment];
}
var_dump($current);

edited Apr 26, 2019 at 18:03

answered Apr 26, 2019 at 14:50

blupointmedia

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3 Comments

Peter Over a year ago

It doesn't pick up this: $searchPart = "Products->Product->Offer->Price->attributes()->currency";

blupointmedia Over a year ago

@Peter, I updated my answer with a second route so you can get your attributes.

Peter Over a year ago

Yap, Converting to regular array is the best option. Thanks !

Matteo Meil · Accepted Answer · 2019-04-26 14:52:20Z

0

You can take a look at eval that take your code as a string and evaluates it, but I strongly discourage its usage because it's a potentially (and very big) security hole.

Instead you could use explode passing as first argument -> and then loop over the resulting array to get the value you need:

$search_part = "Products->Product->Offer->Price->TotalPrice";
$chunks = explode("->", $search_part);

foreach ($chunks as $chunk) {
  $temp = $xmlobj[$chunk];
}

$product_total_price = $temp;

or something similar, and then you will get you price dynamically

Note that if $xmlObj is of type Object you will need to use $xmlObj->{$chunk} instead of $xmlobj[$chunk]

edited Apr 26, 2019 at 14:52

answered Apr 26, 2019 at 14:49

Matteo Meil

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2 Comments

Peter Over a year ago

No the point is that whole "string" in variable $search_part will be changed externally... so it can be: $search_part = Products->Product->Offer->Price->attributes()->currency; or any other "path..."

Matteo Meil Over a year ago

This will work even in that case, it's enough to know what is the delimiter of the path

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