Check if one of the elements of array is within other array

Question

I want to check to see if a voucher is valid for an event. The voucher can be valid on certain days (mo-su) which is stored in an array:

$validOn = [1,3,4]; // Monday, Thursday

An event can be happening on 1 or more days:

$event = [2,6]; // Tuesday, Saturday (unique)

How can I check if the voucher is valid for the given event?

valid([2,6], $validOn); // false
valid([1,6], $validOn); // true
valid([1,4], $validOn); // true
valid([3], $validOn);   // true
etc etc

invisal · Accepted Answer · 2017-03-30 11:11:33Z

2

You can use array_intersect

function valid($a, $b) {
   return  count(array_intersect($a, $b)) > 0;
}

answered Mar 30, 2017 at 11:11

invisal

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Comments

sietse85 · Accepted Answer · 2017-03-30 11:11:39Z

1

Try this

$result = array_intersect($validOn, $event);
if(count($result) > 0) {
  //we have a match
}

answered Mar 30, 2017 at 11:11

sietse85

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