Access php multidimensional array key based on a variable string

Question

I have stored the XML path to items in a string like this: response->items->item.

What I need to do is to access an array called $xml_array like this:

$xml_array['response']['items']['item']

When I write it in the code it works. The thing is that I want it to be done on the fly.

I use this to convert response->items->item to ['response']['items']['item']:

$xml_path = 'response->items->item';
$explode_path = explode('->', $xml_path);
$correct_string = false;

foreach($explode_path as $path) {
   $correct_string .= '[\''.$path.'\']';
}

the problem is that I can't access $xml_array by doing this: $xml_array[$correct_string]

So I end up with this:

$xml_tag = 'title';
$xml_path = 'response->items->item';

$correct_string = '$items = $xml2array';

$explode_path = explode('->', $xml_path);

foreach($explode_path as $path) {
    $correct_string .= '[\''.$path.'\']';
}
$correct_string .= ';';

eval($correct_string);
foreach($items as $item) {
    echo $item[$xml_tag].'<br />';
}

and access the $xml_array array through $items array. Is there any way I can do this and avoid using eval()?

Thanks in advance!

ghoti · Accepted Answer · 2012-03-27 05:24:54Z

I'm really glad that your goal is to stop using eval(). :-)

If I've understood you correctly, you have an array of $items and you're trying to locate things in it based on the contents of $xml_path.

I obviously haven't tested this on your data, but what about something like this?

<?php

$xml_path = 'response->items->item';

$explode_path = explode('->', $xml_path);

foreach($items as $item) {
  $step = $item;
  foreach($explode_path as $path) {
    $step = $step[$path];
  }
  echo $step . '<br />';
}

The idea is that for each of the $items, you step through the exploded path, narrowing your search as you go by refining $step perhaps to some unknown depth.

This of course assumes that for any value of $xml_path, there WILL be a corresponding item set in the $items array. Otherwise, you'll want to add some error handling. (You probably want error handling anyway.)

safrazik · Accepted Answer · 2012-03-27 05:24:32Z

3

$xml_tag = 'title';
$xml_path = 'response->items->item';

$explode_path = explode('->', $xml_path);

$items = $xml2array[$explode_path[0]][$explode_path[1]][$explode_path[2]];

foreach($items as $item) {
    echo $item[$xml_tag].'<br />';
}

answered Mar 27, 2012 at 5:24

safrazik

1,61911 silver badges14 bronze badges

2 Comments

ggirtsou Over a year ago

thank you so much for this! what if I want to automatically generate the $items variable instead of manually writing $explode_path[0] etc? After all I will retrieve this from MySQL.

ggirtsou Over a year ago

OK got it:

$explode_path = explode('->', $xml_path);  $count_explode = count($explode_path); $items = $xml2array; for($i=0; $i<$count_explode; $i++) { 	$items = $items[$explode_path[$i]]; }

Sviatoslav Oleksiv · Accepted Answer · 2016-05-31 11:45:46Z

0

    $array = [];
    foreach($items as $item) {
        $inputs[] = [
            $item->name => $item->value
        ];
    }

answered May 31, 2016 at 11:45

Sviatoslav Oleksiv

2,6882 gold badges15 silver badges12 bronze badges

1 Comment

Toby Speight Over a year ago

Although this code may answer the question, providing additional context regarding why and/or how it answers the question would significantly improve its long-term value. Please edit your answer to add some explanation.

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