up vote 1 down vote favorite

I have an array $minus

array(3) { [0]=> string(6) "people" 
           [1]=> string(7) "friends" 
           [2]=> string(8) "siblings" 
         }

And I have an array $user

array(3) { ["people"]=> string(3) "100" 
           ["friends"]=> string(2) "10" 
           ["siblings"]=> string(2) "57" 
         }

I can get the values of $user by using the values of $minus like,

echo $user[$minus[0]] . ', ' . $user[$minus[1]] . ', ' . $user[$minus[2]];
// Would echo: 100, 10, 57

But how can I get the values of $user by using the values of $minus into a new array, the new array should be like,

array(3) { [0]=> string(3) "100" 
           [1]=> string(2) "10" 
           [2]=> string(2) "57" 
         }

I have tried using foreach loops but can never get it right?

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5 Answers

up vote 4 down vote accepted 
foreach($minus as $key=>$value) {
  $new_array[$key] = $user[$value];
}
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Will try this thank you for your answer. – novactown.com Jan 24 at 16:54
Worked brilliantly, thank you for this. Is there any good links for documentation on this? – novactown.com Jan 24 at 16:55
The PHP documentation is always brilliant - php.net/manual/en/control-structures.foreach.php. – Blowski Jan 24 at 16:56
1  
It is better to initialize the array before the foreach. $new_array= array(); – makriria Jan 24 at 16:56
@Michael - yes, I agree. – Blowski Jan 24 at 16:57
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up vote 3 down vote

Use array_map, PHP >= 5.3 only

$new_array = array_map(function($item) use ($user) {return $user[$item];}, $minus);
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This solution only works in PHP >= 3.5 – afuzzyllama Jan 24 at 16:52
It returns NULL thanks though. – novactown.com Jan 24 at 16:53
@novactown.com what's your PHP version? – Dor Shemer Jan 24 at 16:53
It does work now thanks – novactown.com Jan 24 at 17:04
Thanks for this, in terms of speed would this be better or a for each loop? I am guessing this as it doesn't need to iterate through the items or does it? – novactown.com Jan 24 at 18:06
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up vote 1 down vote 
$new_array= array();
foreach ($minus as $key => $value){
 $new_array[$key] =  $user[$value];
    }
print_r($new_array);
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up vote 0 down vote 
$new_array = array($user[$minus[0]], $user[$minus[1]], $user[$minus[2]]);
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I didn't downvote, but it's not the best solution - it only works as long as the keys have that name, and there are exactly 3 members of the array. If the key names or the size of the array change, this will have to be changed. – Blowski Jan 24 at 16:55
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up vote 0 down vote 
$minus = array(0 => "people",
               1 => "friends",
               2 => "siblings"
              );

$user = array("people"   => "100",
              "friends"  => "10",
              "siblings" => "57"
             );


$newArray = $minus;
array_walk($newArray,function(&$item, $key, $prefix) { $item = $prefix[$item]; },$user);

var_dump($newArray);
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