CODEWITHSUNDEEP
phparraysloopsarray-intersect
Geo
Geo

Reputation: 13006

PHP array_intersect() till the first match

I have 2 arrays to compare and find if there is at least a single value in common.

This works just fine:

$arr1 = array(1, 2, 3, 4, 5);
$arr2 = array(2, 3, 4, 5, 6);
if (array_intersect($arr1, $arr2)) {
    // good, at least one match found
}

However, the question is performance. It doesn't make sense to continue looping thru the arrays after the first match was found. Is there a native PHP function or a useful snippet to achieve this?

Will a combination of foreach() and in_array() do the trick?

Upvotes: 2

Views: 2072

Answers (2)

Keith Wipf
Keith Wipf

Reputation: 9

Just compare the first value?

$arr1 = array(1, 2, 3, 4, 5); 
$arr2 = array(2, 3, 4, 5, 6); 
if (array_intersect($arr1, $arr2)[0]) { 
    // good, at least one match found 
}

Upvotes: 0

mavili
mavili

Reputation: 3424

How about this?

foreach ($arr1 as $key => $val) {
    if (in_array($val, $arr2)){
        // do something, maybe return so you wouldn't need break
        break;
    }
}

Upvotes: 3

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