如何合并这两个数组？

Question

How to merge these two arrays...

$arr1 = array(
    [0] => 'boofoo',
    [1] => '2'
);

$arr2 = array(
    [0] => 'fbfb',
    [1] => '6'
);

to get a third array as follows?:

$arr3 = array(
    [0] => 'boofoo',
    [1] => '6'
);

That is, preserve strings that are longer and numeric values that are higher.

Answer 1

I think you can achieve via http://www.php.net/manual/en/function.array-walk.php.

I try and write some test for it soon and update post.

P.S: array_map is better(maybe walk not even good for this?)

<?php

function combine($arr1, $arr2) {
    return array_map("callback", $arr1, $arr2);
}

function callback($item, &$item2) {
    if (is_numeric($item)) {
        return max($item, $item2);
    }
    if (strlen($item2) > strlen($item)) {
        return $item2;
    }
    return $item;
}

class Tests  extends PHPUnit_Framework_TestCase {
    public function testMergingArrays() {
        $arr1 = array(
            'boofoo',
            '2'
        );

        $arr2 = array(
            'fbfb',
            '6'
        );

        $arr3 = array(
            'boofoo',
            '6'
        );

        $this->assertEquals($arr3, combine($arr1, $arr2));
    }
}

I got test in place and I could refactor it now. But this implementation does work.