PHP arrays: cross data

Question

An student here who needs help with the logic of the following:

I have two arrays.

$array1 contains the ids of the places the user has been to.

$array2 contains the ids of the places where the user can obtain one point just by visiting them

Now I need to know if the user has visited any of the places where he/she can get one point so I can grant it to him/her. How can I do that?

Tnaks a lot

Brian Driscoll · Accepted Answer · 2011-02-21 16:23:35Z

7

Looks like you want to try array_intersect

$intersection = array_intersect($array1, $array2);

answered Feb 21, 2011 at 16:23

Brian Driscoll

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Artefacto · Accepted Answer · 2011-02-21 16:22:36Z

4

count(array_intersect($array1, $array2)) should then give you the number of suych places.

answered Feb 21, 2011 at 16:22

Artefacto

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1 Comment

Orbling Over a year ago

Well, this was the best answer.

Damien Pirsy · Accepted Answer · 2011-02-21 16:23:30Z

0

$visited = array('1','2','3','4','5'); // and so on
$awarding = array('3','4','5'); //...

$nr_of_grants = 0;

foreach ($visited as $visit)
{
  if(in_array($visit,$awarding)
  {
    $nr_of_grants++;
  }
}

echo "You've been awarded for".$nr_of_grants."places";  //

answered Feb 21, 2011 at 16:23

Damien Pirsy

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2 Comments

Rafa Over a year ago

He. I was writing this same answer :)

Artefacto Over a year ago

This is less efficient than using array_intersect.

Carlos Campderrós · Accepted Answer · 2011-02-21 16:25:23Z

0

You should use array_intersect($array1, $array2). The result would be the ids of places present in both arrays.

answered Feb 21, 2011 at 16:25

Carlos Campderrós

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