PHP - Get Array value by Index instead of Key

Question

I've got a multidimensional array returned by an API call. The values into this array are stored with a key like this :

Array(["BTC_XRP"] => 1)

I can get the values of the Array by getting them using the keys (like BTC_XRP), but what if I need to get the value using the Index?

For example, how do I get each value of the Array using a for loop if I can't get the values by the Index?

Since the Array is composed by something like 100 values, I need to echo every one using a for loop, but this gives me this error :

Notice: Undefined offset: 0

Is it possible to get to a value using the Index instead of the Key?

Furthermore, I'd like to get the Key by the Index. If I want to get the Key of the first value, I'd like to get it using the 0 Index.

Have you tried $array[0] where 0 is the number in the array to access it. E.g from your question echo $array[0] should output 1. Or am I missing the point? — the_peacock
– the_peacock, Commented Apr 2, 2017 at 11:25
@Ashley Prescott Yes that's exactly what I did, but PHP doesn't let you get a value by Index if it's stored as Key. — DamiToma
– DamiToma, Commented Apr 2, 2017 at 11:29

Erwin Hofman · Accepted Answer · 2017-04-02 11:46:33Z

8

Sounds like you are in search of array_keys (to get key by index) and array_values (to get value by index) functions:

$array = array("BTC_XRP" => 1, "EUR_XRP" => 234, "USD_XRP" => 567);
$keys   = array_keys( $array );
$values = array_values( $array );

var_dump( $keys[1] ); // string(7) "EUR_XRP"
var_dump( $values[1] ); // int(234)

Or use a foreach as Joshua suggests.

answered Apr 2, 2017 at 11:46

Erwin Hofman

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Your Common Sense · Accepted Answer · 2023-06-27 12:27:42Z

4

This question has a confusing title. What the OP needed is simply how to iterate over associative array. And the answer is just as silly:

foreach ($array as $key => $value) {
    echo "Key: $key, value: $value";
}

But the title, that attracts people from Google search, explicitly asks how to get a certain value from associative array by its position (or "index"). For this you need a function called array_slice():

$array = array('a'=>'apple', 'b'=>'banana', '42'=>'pear', 'd'=>'orange');

$index = 2;
$elem = array_slice($array, $index, 1, true);
$key = key($elem);
$value = reset($elem);
echo "Key: $key, value: $value"; // Key: 42, value: pear

edited Jun 27, 2023 at 12:27

Your Common Sense

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answered Apr 2, 2017 at 11:30

joshua miller

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