Array keys ,get array values ,then comma separate

Question

I have :

$a = array(
    0=>'you',
    1=>'will',
    2=>'be',
    3=>'so',
    4=>'happy',
    5=>'in'
);

$b = array(
    0=>'1',
    1=>'4',
    2=>'5'
);   // (KEYS:1,4,5)

I want out the values of $a that matches $b's keys;

so $val would be willhappyin.

And then comma-separate them.. like: will,happy,in without comma after last one.

How can i do this ? :)

What i have tried is somewhat like this, but i thought i had it all wrong.. and i was right :) — teecee
– teecee, Commented Feb 27, 2012 at 16:44

Travesty3 · Accepted Answer · 2012-02-27 16:42:26Z

7

$string = implode(",", array_intersect_key($a, array_flip($b)));

EXPLANATION:

array_flip switches the values of $b to keys.

array_intersect_key takes only the entries in $a that are also present in $b.

implode joins the resulting array values together by comma.

answered Feb 27, 2012 at 16:42

Travesty3

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4 Comments

Ofir Baruch Over a year ago

wow , first time hearing about this function array_intersect_keys - will use it in the future!

gen_Eric Over a year ago

It's actually array_intersect_key.

Travesty3 Over a year ago

@OfirBaruch: Actually, the function is array_intersect_key (no s on the end). See corrected answer.

teecee Over a year ago

Wow.. so easy :) here i have played with foreach for hours without getting my results. Thanks so much!!

Ofir Baruch · Accepted Answer · 2012-02-27 16:38:02Z

2

$c = array();
foreach($b as $key)
{
  $c[] = $a[$key]
}

echo implode(",",$c);

answered Feb 27, 2012 at 16:38

Ofir Baruch

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Comments

Alexander Corwin · Accepted Answer · 2012-02-27 16:37:53Z

0

$out_arr = array();
foreach ($b as $k => $v) {
  array_push($out_arr, $a[$v]);
}

return join($out_arr, ',');

answered Feb 27, 2012 at 16:37

Alexander Corwin

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