access values from a associative array only using there array index number

Question

First I have this associative array

$players = array("group1" => array("player1" => "Kevin Durant", "player2" => "Kyrie Irving"), "group2" => array("player1" => "Demian Lillard", "player2" => "Derrick Rose"));

I know I can just use this way of looping

//create an empty array to be used as a container for our looped array
$data_arrays = array();
foreach($players as $data=>$key):
    array_push($data_arrays,$key['player1'],$key['player2']);
endforeach;

but what I want is get there value base on there array index, e.g.

foreach($players as $data=>$key):
    array_push($data_arrays,$key[0],$key[1]);
endforeach;

but unfortunately and sadly, it returms me an error,

Undefined offset: 0

any help, clues, suggestions, recommendations, ideas please?

Decent Dabbler · Accepted Answer · 2016-02-26 03:05:56Z

2

You could use array_values():

foreach($players as $data=>$key):
    $groupPlayers = array_values( $key );
    array_push($data_arrays,$groupPlayers[0],$groupPlayers[1]);
endforeach;

As a side note: your use of the variable names $data and $key is rather unorthodox: the key is the index of an array element, data is usually considered the value of the array element. So I would suggest to switch them, i.e.:

foreach($players as $key=>$data):
    $groupPlayers = array_values( $data );
    array_push($data_arrays,$groupPlayers[0],$groupPlayers[1]);
endforeach;

edited Feb 26, 2016 at 3:05

answered Feb 26, 2016 at 2:25

Decent Dabbler

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5 Comments

Juliver Galleto Over a year ago

cool, how about if I'm going to get the name of the array object, e.g. I want to get the name of $players[0] which is 'player1', any ideas how to do that please?

Decent Dabbler Over a year ago

@CodeDemon For that you could simply use the value of the $key variable that's already defined (in my second example, that is). Else you could use array_keys(), in the same way I demonstrated the use of array_values().

pradeepcep Over a year ago

As a side note: If you have numeric indices, array_values() will ignore them and index your array based on the foreach() ordering.

Decent Dabbler Over a year ago

@CodeDemon Sorry, the first statement in my reply comment was not correct, of course. $key will hold "group1", etc. (the key value of the outer array), not "player1", etc.

Decent Dabbler Over a year ago

@CodeDemon Another sloppy thing of me is that you should choose another variable name than $players inside the foreach loop; otherwise it will overwrite the original $players array. Sorry about that; I'll correct this in my answer.

Aziz Saleh · Accepted Answer · 2016-02-26 02:44:10Z

Something like this would work:

<?php
$players = array("group1" => array("player1" => "Kevin Durant", "player2" => "Kyrie Irving"), "group2" => array("player1" => "Demian Lillard", "player2" => "Derrick Rose"));

$data_arrays = array();
foreach($players as $data => $key):
    $data_arrays = array_merge($data_arrays, array_values($key));
endforeach;

print_r($data_arrays);

Demo: http://sandbox.onlinephpfunctions.com/code/e5133c3f317beccc5c2b0bbd56770359a1040c37

An Alternative, shorter way to do it using array_reduce:

$players = array("group1" => array("player1" => "Kevin Durant", "player2" => "Kyrie Irving"), "group2" => array("player1" => "Demian Lillard", "player2" => "Derrick Rose"));

$players = array_reduce($players, function(&$players, $v) {return array_merge(array_values($players), array_values($v));}, array());

print_r($players);

Demo: http://sandbox.onlinephpfunctions.com/code/92c51ac92fdfde40df3e4fc9d469d52d19f05376

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