PHP Multidimensional Arrays - Creating and Reading Data

Question

I have a little problem with multidimensional arrays. I think they are not like those in JAVA. For instance; I have created a array something like this;

$myArray = array();

Then I try to assign 4 different arrays to it as following.

$myArray[0] = $newArray0;
$myArray[1] = $newArray1;
$myArray[2] = $newArray2;
$myArray[3] = $newArray3;

But when I try to read a data from a cell with following line,

$myArray[0][2];

I could not get the data what I was hoping for. Can you guys tell me where am I mistaken?

Thanks a lot!

what is the structure of your $newArray0, $newArray1, etc? — Pav
– Pav, Commented May 5, 2011 at 23:18
You can refer to multidimensional arrays like that, so there must be something wrong with the $newArrayX variables. — Kelly
– Kelly, Commented May 5, 2011 at 23:18
I get the same thing in my code when I try to do $someArray[x]->someMethod(); - it just doesn't work for some reason. — Ry-
– Ry- ♦, Commented May 5, 2011 at 23:20
Actually those $newArrayXs are the arrays that are kept from database. Will there be any mistake in there? I use mysql_fetch_array function and hope to create an array consisting of some part of column. — makyol
– makyol, Commented May 6, 2011 at 0:50

Joshua - Pendo · Accepted Answer · 2011-05-05 23:23:36Z

2

What you're trying to do should work, try to make sure that $newArray0 is also a numeric array and not an associative array. You can find out how your array is being setup with the following code:

<?php
  echo '<pre>';
  print_r($myArray);
  echo '</pre>';
?>

If you've done it the right way, the output must be something similar to:

Array (
  [0] => Array (
    [1] => Value,
    [2] => Value
  ),
  [1] => Array (
    [1] => Etc,
    [2] => Etc
  )
)

If that's what it says, then $myArray[0][2] should say 'Etc'.

answered May 5, 2011 at 23:23

Joshua - Pendo

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3 Comments

makyol Over a year ago

What do you mean by associative array?

Joshua - Pendo Over a year ago

a numeric array is $array[0], $array[1], while an associative array contains DB fieldnames for example $array['user_id'] or $array['user_name']

Joshua - Pendo Over a year ago

Thus, if the 2nd was an associative array you would have had to use $myArray[0]['key_name'] for example. You can use mysql_fetch_array($result, MYSQL_NUM) for a numeric resultset, MYSQL_ASSOC for an associative one and MYSQL_BOTH (which is the default) to get a resultset containing both: php.net/manual/en/function.mysql-fetch-array.php

mcgrailm · Accepted Answer · 2011-05-05 23:33:15Z

1

you got the right idea

$myArray = array();
$myArray1 = array("a","b","c");
$myArray2 = array("d","e","f");
$myArray3 = array("g","h","i");

$myArray[0] = $myArray1;
$myArray[1] = $myArray2;
$myArray[2] = $myArray3;

echo($myArray[0][2]);

WORKING DEMO

answered May 5, 2011 at 23:33

mcgrailm

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