in_array（）用于数组的数组

Question

Is there a function like in_array() than can, check conntent inside array of arrays?

I tried:

$day_events = Array();
array_push($day_events,array('aa','bb','cc'));
array_push($day_events,array('aa','bc','cd'));
array_push($day_events,array('ac','bd','ce'));
echo '<br />';
echo in_array('aa',$day_events); // empty
echo '<br />';
foreach ($day_events as &$value) {
    echo in_array('aa',$value); // 11
}

first in_array() which is the kind of function I am looking for (avoiding the loop) gave empty.

Answer 1

Use this function, as in_array doesn't natively support multi-dimensional arrays:

function in_array_r($needle, $haystack, $strict = false) {
    foreach ($haystack as $item) {
        if (($strict ? $item === $needle : $item == $needle) || (is_array($item) && in_array_r($needle, $item, $strict))) {
            return true;
        }
    }

    return false;
}

In this case you would you use it like this:

echo in_array_r('aa', $day_events) ? 'Found' : 'Not found';

It was taken from this answer: https://stackoverflow.com/a/4128377/2612112 .

Answer 2

By the way it is not avoiding first one it is avoiding the last one which has 'ac'. So you get true from first two. Your code works but I am not sure if that is what you want.