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up vote 0 down vote favorite

I have this array:

array (size=5)
  35 => string '3' (length=1)
  24 => string '6' (length=1)
  72 => string '1' (length=1)
  16 => string '5' (length=1)
  81 => string '2' (length=1)

I want to implode id to get:

$str = '35-3|24-6|72-1|16-5|81-2';

How to get it the easy way?

Thanks.

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When you say How to get it the easy way? you mean without loop right ? –  Baba Nov 11 '12 at 14:25
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4 Answers

up vote 1 down vote accepted

I haven't tested this, but it should be pretty straight forward ...

foreach($array as $key=>$item){
    $new_arr[] = $key."-".$item;
}

$str = implode('|', $new_arr);
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up vote 4 down vote

One possibility would be like this 

function mapKeyVal($k, $v) {
    return $k . '-' . $v;
}

echo implode('|', array_map('mapKeyVal', 
                            array_keys($arry), 
                            array_values($arry)
                           )
      );
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+1 Don't forget that you can implement an anonymous function ! php.net/manual/en/functions.anonymous.php –  HamZa Nov 11 '12 at 14:30
1  
yes, I thought it would make it a bit "more understandable" :-) –  Havelock Nov 11 '12 at 14:31
    
Anonymous function($l, $r) { return "$l-$r"; }. –  gremo Nov 11 '12 at 14:32
2  
Thanks @Gremo, as I said above, considering the question, wanted to make the answer not "too complicated" :-) –  Havelock Nov 11 '12 at 14:35
    
@Havelock: This solution works, and while callback can be anonymous function, there are many hosts out there supporting PHP older than 5.3 (so without anynymous functions). See my answer for more general alternative. –  Tadeck Nov 11 '12 at 14:47
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up vote 3 down vote

You cannot can do this using implode, see @havelock's answer below, however it would be easier to use a loop or another form of iteration.

$str = "";

foreach ($array as $key => $value) {

    $str .= $key . "-" . $value . "|";

}

$str = substr(0, strlen($str)-1);
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You can use rtrim() as well to remove last "|" –  GBD Nov 11 '12 at 14:26
    
I would insist you can do that with implode() as part of the solution as well... see my answer :-) –  Havelock Nov 11 '12 at 14:30
1  
@Havelock I have updated the q :) –  max_ Nov 11 '12 at 14:31
    
He can have a scroll of the page if he wants to see the other options, I don't need to list them in my answer. –  max_ Nov 11 '12 at 14:33
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up vote 1 down vote

Solution

You can do it cleanly by joining strings, while using eg. custom associative mapping function, which looks like that:

function array_map_associative($callback, $array){
    $result = array();
    foreach ($array as $key => $value){
        $result[] = call_user_func($callback, $key, $value);
    }
    return $result;
}

Full example and test

The full solution using it could look like that:

<?php

function array_map_associative($callback, $array){
    $result = array();
    foreach ($array as $key => $value){
        $result[] = call_user_func($callback, $key, $value);
    }
    return $result;
}

function callback($key, $value){
    return $key . '-' . $value;
}

$data = array(
    35 => '3',
    24 => '6',
    72 => '1',
    16 => '5',
    81 => '2',
);

$result = implode('|', array_map_associative('callback', $data));

var_dump($result);

and the result is:

string(24) "35-3|24-6|72-1|16-5|81-2"

which matches what you expected.

The proof is here: http://ideone.com/HPsVO6

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