PHP: Does array have key that is value in another array

Question

so for example I have an associative array like

array( "a" => 23, "b" => 48, "c" => 10, "d" => 19 )

Let's call it ArrayA. And another array (ArrayB) that is

array( "a", "c" )

I want to get ArrayA's keys that do not occur in ArrayB, which would be "b" and "d".

I haven't found anything useful when googling but I assume that there is a php function for that or how would you solve this as fancy as possible?

Possible duplicate of Compare all values in php array with the other values — Jonathon Ogden
– Jonathon Ogden, Commented Nov 25, 2016 at 17:12
thank you Mark and Ruslan, this is what I expected :) both work, I'll go with the shorter one — Cutaraca
– Cutaraca, Commented Nov 25, 2016 at 17:18

baubali · Accepted Answer · 2016-11-25 17:47:17Z

0

You can doit with array_diff() and array_keys()
Manual array_diff: http://php.net/manual/en/function.array-diff.php
Manual array_keys: http://php.net/manual/en/function.array-keys.php

With array_diff() the function returns an array containing all the entries from array1 that are not present in any of the other arrays.
And with array_keys() will return the keys, numeric and string, from the array. You can add specific search options with this function to.

<?php
$ArrayA = array("a" => 23, "b" => 48, "c" => 10, "d" => 19);
$ArrayB = array("a", "c");
$result = array_diff(array_keys($ArrayA), $ArrayB);

print_r($result);
?>

Regards

answered Nov 25, 2016 at 17:47

baubali

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