Joining Arrays in PHP

Question

This is really simple but I need a quick way to do this.

I have three arrays like

$a = array('a','b','c');
$p = array('p','q','r');
$x = array('x','y','z');

How do I combine them to make

array (
    [0] => array ('a','p','x');
    [1] => array ('b','q','y');
    [2] => array ('c','r','z');
);

i am not sure you can use the same index for different arrays — Sarfraz, Dec 26 '09 at 08:48
@atif089, I changed the indexes from `0` to `0,1,2` because your question seemed to be centered around the values changing and not the three items with the same index. — Doug Neiner, Dec 26 '09 at 08:52

score 2 · Answer 1 · answered Dec 26 '09 at 08:48

2

<?php
$a = array('a','b','c');
$p = array('p','q','r');
$x = array('x','y','z');

$arr = array();
for($i=0; $i<count($a); $i++){
  $arr[$i] = array($a[$i], $p[$i], $x[$i]);
}
?>

answered Dec 26 '09 at 08:48

echo

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I was doing the same lol. i thought tehre might be a better way :) – Atif Dec 26 '09 at 08:50
there's probably a tricky PHPism that would do it, but whatever... get 'r done, as it were. – echo Dec 26 '09 at 08:56
Better use the `min(count($a), count($p), count($x))` to get the largest common index if the arrays do not have the same size. – Gumbo Dec 26 '09 at 09:50
arays are always going to be of same size – Atif Dec 26 '09 at 14:14

score 2 · Accepted Answer · edited Apr 06 '12 at 09:46

2

Wouldn't array_map(null, $a, $p, $x); be better?

See array_map^Docs.

edited Apr 06 '12 at 09:46

hakre

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answered Dec 26 '09 at 09:54

Matěj G.

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score 0 · Answer 3 · answered Apr 06 '12 at 09:23

array_map is simpler, but for the sake of possibibility, a quickly typed code example to make use of the MultipleIterator to solve the issue:

$it = new MultipleIterator;
foreach(array($a, $p, $x) as $array) {
    $it->attachIterator(new ArrayIterator($array));
}
$items = iterator_to_array($it, FALSE);

Might be handy in case it's more than an array.

Joining Arrays in PHP

3 Answers3

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