PHP join 2 arrays

Question

I have 2 arrays

$array1 = array(
    ['2013-05-01']=>'test',
    ['2013-05-02']=>'testing',
    ['2013-05-03']=>'working',
    ['2013-05-04']=>'future test');

$array2 = array(
    ['2013-05-01']=>'1',
    ['2013-05-02']=>'done',
    ['2013-05-03']=>'code',
    ['2013-05-05']=>'release');

I want to join these array, so that output is

$result = array(
        ['2013-05-01']=>'test 1', 
        ['2013-05-02']=>'testing 2',
        ['2013-05-03']=>'working code',
        ['2013-05-04']=>'future test',
        ['2013-05-05']=>'release')

I tried $result = $array1 + array2; array_merge() , array_combine() none gave the correct result.

Can you help me please.

You need to write your own code to do this. There is no built in functions. — John Conde
– John Conde, Commented May 22, 2013 at 2:09
It keeps surprising me that people expect PHP to have a builtin function for every single scenario that a starting programmer should be able to solve without effort. — Niels Keurentjes
– Niels Keurentjes, Commented May 22, 2013 at 2:14
function array_join($arr1, $arr2) {return array(['2013-05-01']=>'test 1', ['2013-05-02']=>'testing 2',['2013-05-03']=>'working code');} - just messing ;) — i--
– i--, Commented May 22, 2013 at 2:14

Micha Schwab · Accepted Answer · 2013-05-22 02:23:54Z

6

foreach($array2 AS $key => $value)
{
    $array1[$key] = isset($array1[$key]) ? $array1[$key] . " " . $value : $value;
}

edited May 22, 2013 at 2:23

answered May 22, 2013 at 2:15

Micha Schwab

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6 Comments

Micha Schwab Over a year ago

Error handling for what? The case that $array1 doesn't contain the keys of $array2 is taken care of.

BlitZ Over a year ago

I suggest to use isset() instead of empty().

Micha Schwab Over a year ago

Good suggestion. If $array1 would contain a '0' as value, it would be deleted this way.

BlitZ Over a year ago

@zerkms There are a lot of empty() calls? :))) empty($array1[$key]) suggested to be isset($array1[$key]).

Ja͢ck Over a year ago

This has the potentially unintended side effect of modifying $array1.

|

zerkms · Accepted Answer · 2013-05-22 02:16:38Z

6

Here is a one-line solution for the issue:

$array1 = array(
    '2013-05-01'=>'test',
    '2013-05-02'=>'testing',
    '2013-05-03'=>'working',
    '2013-05-04'=>'future test');

$array2 = array(
    '2013-05-01'=>'1',
    '2013-05-02'=>'done',
    '2013-05-03'=>'code',
    '2013-05-05'=>'release');


$r = array_map(function($i) {
    return !is_array($i) ? $i : implode(' ', $i);
}, array_merge_recursive($array1, $array2));

var_dump($r);

Online demo: http://ideone.com/wmbple

answered May 22, 2013 at 2:16

zerkms

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4 Comments

Niels Keurentjes Over a year ago

Dammit I spent 5 minutes typing this out on crappy iPad softkeys just to have some slacker with a real keyboard beat me to the punch.

zerkms Over a year ago

@Niels Keurentjes: "just to have some slacker with a real keyboard beat me to the punch" --- "slacker"? Is it a joke?

Ja͢ck Over a year ago

@NielsKeurentjes For someone typing answers on an iPad, it's debatable who's the slacker =p

Niels Keurentjes Over a year ago

@Jack have you ever tried? All the curlies and everything are hidden behind like 5 keypresses each, and you have to deal with Apple's idea of capitalization :P

Ja͢ck · Accepted Answer · 2013-05-22 02:25:45Z

1

You could use array_walk():

$result = $array1;
array_walk($result, function(&$value, $key) use (&$array2) {
    $value .= ' ' . $array2[$key];
});

Demo

This modifies $result (copied from $array1) in-place with values looked from $array2 based on the array keys.

edited May 22, 2013 at 2:25

answered May 22, 2013 at 2:19

Ja͢ck

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Comments

score 0 · Accepted Answer · 2013-05-22 02:30:49Z

It's better to write a function for it and keep it in your toolkit:

function merge_array() {
    $merged = array();
    $arrays = func_get_args();

    if ($arrays) {
        foreach ($arrays as $array) {
            foreach ($array as $key => $value) {
                if (isset($merged[$key])) {
                    $merged[$key] .= ' ' . $value;
                }
                else {
                    $merged[$key] = $value;
                }
            }
        }
    }

    return $merged;
}

Now pass $array1 and $array2 to it:

$result = merge_array($array1, $array2);

And you will get this result:

// Array
// (
//     [2013-05-01] => test 1
//     [2013-05-02] => testing done
//     [2013-05-03] => working code
//     [2013-05-04] => future test
//     [2013-05-05] => release
// )

Note that this function accept more than two arrays if you want.

[!] Check it online at ideone.

priteshbaviskar · Accepted Answer · 2013-05-22 02:33:19Z

0

array_walk() would be the easiest way to do it.

answered May 22, 2013 at 2:33

priteshbaviskar

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