How to use in_array() to check if an associative row exists in another array of associative arrays

Question

I'm passing data from my controller to view, I have code in my view

foreach ($mapData as $map)
{
 echo $map['x'].';'.$map['y'].'<br/>';
}

And it prints me something like

5;5
6;6
7;7

Now, I am passing another data from my database as a two-dimensional array which looks like something like this

Array
(
[0] => Array
    (
        [x] => 5
        [y] => 4
    )

[1] => Array
    (
        [x] => 5
        [y] => 5
    )

)

I want to check if any of $map['x'] and $map['y'] exists in that array so I am doing (Don't know any other way because I need to check this in foreach loop)

if (in_array(array($map['x'], $map['y']), $array)) {
echo 1;
}

But it doesn't work and according to http://php.net/manual/en/function.in-array.php it should work? What am I doing wrong?

Shouldn't it be $mapData instead of $array? (perhaps you just used it as an example) — federicot
– federicot, Commented Aug 4, 2013 at 21:49
No, $array is different array than $mapData.. I already have an answer, thanks anyway. — user1905315
– user1905315, Commented Aug 4, 2013 at 22:00

thecodeparadox · Accepted Answer · 2013-08-04 21:44:24Z

1

Array
(
[0] => Array
    (
        [x] => 5
        [y] => 4
    )

[1] => Array
    (
        [x] => 5
        [y] => 5
    )

)

should look like

Array
(
[0] => Array
    (
        [0] => 5
        [1] => 4
    )

[1] => Array
    (
        [0] => 5
        [1] => 5
    )

)

That means, $array (i.e. haystack) should not be an array with different indexing than neddle.

You are passing index x and y as haystack. But in needle you are just passing like array(5,5) or array(6,6) and so on.

According to doc, in_array() can compare

in_array( array(5,5), array( array(5,5), array(6,6) ) )

but not

in_array( array(5,5), array( array('x' =>5, 'y' => 5), array('x' => 6, 'y' => 6) ) )

answered Aug 4, 2013 at 21:44

thecodeparadox

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Comments

federicot · Accepted Answer · 2013-08-04 21:55:09Z

0

in_array is working properly, it's just that you're comparing an array without keys to an array that has an x and y as keys for their values. Try giving our new array the corresponding keys and then comparing:

if (in_array(array('x' => $map['x'], 'y' => $map['y']), $array)) {
    echo '1';
}

answered Aug 4, 2013 at 21:55

federicot

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