PHP Array Matching

Question

I'm semi-new to PHP and looking for a good way to match arrays. Note that I'm going to write my arrays here in python syntax because its way easier to type, but I'm working in PHP.

I have an array that is something like this: {3:4,5:2,6:2}

Then I have an array of arrays, with the inners arrays having the same basic form as the array above. I'd like to write a function that returns all arrays that match the given array, ignoring extra values.

So I want the array above to match {3:4,6:2,5:2} or {3:4,5:2,6:2,7:2}

but not {3:4,5:2} or {3:4,5:2,6:3}

I probably could get it to work, but I doubt the code would be all that great. So I'd love the opinion of better PHP developers.

Thanks

user187291 · Accepted Answer · 2010-12-09 19:32:45Z

3

you want array_intersect or array_intersect_key

$a = array(1 => 11, 3 => 33, 2 => 22);
$b = array(3 => 33, 5 => 55, 2 => 22, 1 => 11);

if (array_intersect_key($a, $b) == $a)
    echo "b contains a";

answered Dec 9, 2010 at 19:32

user187291

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Comments

Jon Snyder · Accepted Answer · 2010-12-09 19:32:24Z

0

I don't think there is a pre-defined function in php that will help with this sort of thing. Just loop through all the arrays and find the ones that match your criteria.

function query( $query, $arrayOfArrays) {

  $ret = array();
  foreach( $arrayOfArrays as $array) {
    if( matches( $array, $query) ) {
      $ret[] = $array;
    }
  }
  return $ret;
}

function matches( $array, $query) {
  foreach( $query as $key => $value) {
    if( !isset( $array[$key]) || $array[$key] != $value) {
      return false;
    }
  }
  return true;
}

answered Dec 9, 2010 at 19:32

Jon Snyder

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1 Comment

lovefaithswing Over a year ago

I ended up using this code, but changing the matches function to use the intersect function.

user187291 · Accepted Answer · 2011-10-07 01:43:04Z

0

If you have PHP 5.3 then you can use a closure along with array_filter:

// array to test against
$test = array(
    3 => 4,
    5 => 2,
    6 => 2
);

// array of arrays you need to check
$subjects = array(
    array(3 => 4, 5 => 2, 6 => 2),
    array(3 => 4, 6 => 2, 5 => 2, 7 => 2),
    array(3 => 4, 5 => 2),
    array(3 => 4, 5 => 2, 6 => 3),
);

// make $test available within the filter function with use
$result = array_filter($subjects, function($subject) use ($test) 
{
    // making use of array_intersect_key
    // note that $subject must be the first parameter for this to work
    return array_intersect_key($subject, $test) == $test;
});

$result will contain only the matching arrays

edited Oct 7, 2011 at 1:43

user187291

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answered Dec 9, 2010 at 20:01

rojoca

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Comments

mickmackusa · Accepted Answer · 2025-09-16 12:31:40Z

0

Filter out any row which does not match all of the associative elements in the search array. Demo

$needle = [3 => 4, 5 => 2, 6 => 2];

$haystack = [
    [3 => 4, 5 => 2],
    [5 => 2, 3 => 4, 6 => 2],
    [3 => 4, 6 => 2, 5 => 2, 7 => 2],
    [3 => 4, 5 => 2, 6 => 3],
];

var_export(
    array_filter(
        $haystack,
        fn($hay) => !array_diff_assoc(
            $needle,
            $hay
        )
    )
);

array (
  1 => 
  array (
    5 => 2,
    3 => 4,
    6 => 2,
  ),
  2 => 
  array (
    3 => 4,
    6 => 2,
    5 => 2,
    7 => 2,
  ),
)

answered Sep 16 at 12:31

mickmackusa♦

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