PHP multi dimensional arrays

Question

I have two questions.

How can i create an array which i can add two values per index like:

$sample[0] = ("abc",10);

Second is that once i have created this array i would like to sort this array according to the 2nd value at the index.

So if i have an array like:

$sample[0] = ("abc",32);
$sample[1] = ("def",11);

The sorted result should be:

$sample[0] = ("def",11);
$sample[1] = ("abc",32);

t3chguy · Accepted Answer · 2014-07-17T14:09:13.070

1

Answer to part one:

$sample[0] = array("abc", 10);

Answer to part two:

array_multisort($sample, SORT_NUMERIC);

Testing Environment:

<?php

$sample[0] = array("abc", 32);
$sample[1] = array("def", 11);
print_r($sample);

array_multisort($sample, SORT_NUMERIC);

echo '<br />';
print_r($sample);

?>

Output:

Array ( [0] => Array ( [0] => abc [1] => 32 ) [1] => Array ( [0] => def [1] => 11 ) ) 
Array ( [0] => Array ( [0] => def [1] => 11 ) [1] => Array ( [0] => abc [1] => 32 ) )

Warning from @Deceze: Above functionality is coincidental; correct code is:

usort($sample, function ($a, $b) { return $a[1] - $b[1]; })

edited Jul 17 '14 at 14:09

answered Jul 17 '14 at 13:46

t3chguy

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6
17

I have declared my array as `$sample = array();`. I have a while loop where `$i` is the iterator. I am unable to add something like: `$sample[$i] = ("abc",12);` – user3760741 Jul 17 '14 at 13:53
1

`$sample[$i] = array("abc", 12);` – t3chguy Jul 17 '14 at 13:54
Check out the answer to part two, just tested it; – t3chguy Jul 17 '14 at 14:01
1

`usort($sample, function ($a, $b) { return $a[1] - $b[1]; })` - this is the correct sort. I'm not sure why `array_multisort` supposedly works, but that's only coincidence if anything. – deceze Jul 17 '14 at 14:05
Feel free to try the above code, tested in EasyPHP Dev Server Environment – t3chguy Jul 17 '14 at 14:07
http://3v4l.org/j8eRh - it does *not* work. – deceze Jul 17 '14 at 14:08
Yeah I just tried it with more than the initial two also, thus referred do you – t3chguy Jul 17 '14 at 14:09
yeah @user3760741 but are you finally getting the multi-dimensional arrays right? You can't have `= (foo, bar)`, you can though; have `= [foo, bar]` since PHP5.4 – t3chguy Jul 17 '14 at 14:11
@deceze your solution only is working – user3760741 Jul 17 '14 at 14:11

PHP multi dimensional arrays

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