Array values to check another array values in PHP?

Question

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?

Dan Blows · Accepted Answer · 2012-01-24 16:49:41Z

4

foreach($minus as $key=>$value) {
  $new_array[$key] = $user[$value];
}

answered Jan 24, 2012 at 16:49

Dan Blows

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4 Comments

novactown.com Over a year ago

Worked brilliantly, thank you for this. Is there any good links for documentation on this?

Dan Blows Over a year ago

The PHP documentation is always brilliant - php.net/manual/en/control-structures.foreach.php.

makriria Over a year ago

It is better to initialize the array before the foreach. $new_array= array();

makriria Over a year ago

You agree but I am unvotted :P Just kidding

dorsh · Accepted Answer · 2012-01-24 16:49:19Z

3

Use array_map, PHP >= 5.3 only

$new_array = array_map(function($item) use ($user) {return $user[$item];}, $minus);

answered Jan 24, 2012 at 16:49

dorsh

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3 Comments

dorsh Over a year ago

@novactown.com what's your PHP version?

novactown.com Over a year ago

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?

dorsh Over a year ago

@novactown.com It should be faster, but you should probably benchmark the two. Also, if you use this in several places, you might wanna make it a named function instead of an anonymous one, as I'm not sure how the interpreter optimizes it.

makriria · Accepted Answer · 2012-01-24 16:51:24Z

1

$new_array= array();
foreach ($minus as $key => $value){
 $new_array[$key] =  $user[$value];
    }
print_r($new_array);

answered Jan 24, 2012 at 16:51

makriria

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Comments

Ninja · Accepted Answer · 2012-01-24 16:50:09Z

0

$new_array = array($user[$minus[0]], $user[$minus[1]], $user[$minus[2]]);

answered Jan 24, 2012 at 16:50

Ninja

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1 Comment

Dan Blows Over a year ago

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.

Mark Baker · Accepted Answer · 2012-01-24 17:05:06Z

0

$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);

answered Jan 24, 2012 at 17:05

Mark Baker

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