PHP根据函数创建二维数组

Question

I have an array like this:

[apple] => 11
[pear] => 5
[banana] => 3
[cucumber] => 2
[tomatoes] => 8

I would like to create multi-dimensional array like this:

[randomArrayName1]
        [apple] => 11
        [banana] => 3
        [tomatoes] => 8
[randomArrayName2]
        [pears] => 5
        [cucumber] => 2

I wrote this below but it is not working and I have no clue how to make it do: what I need it to do

$quantity = array();
foreach($fruit as $key => $value) {
    $quantity = Finder($key);
}

randomArrayName1 and randomArrayName2 will be generated depending on Finder() function's result. Depending on that result I want fruit array to be created as a second dimension array.

---

Solution: The problem was that the function I wrote that created names like randomArrayName1, randomArrayName2... was in fact a XML function. Therefore, result of this function was not an array, it was XML simple object. This caused problem on creating multidimensional array. Once I implemented the code below it converted SimpleXML to Array and code worked fine. $type is SimpleXML array $out is result array

   foreach ( (array) $type as $index => $node )
    $out[$index] = ( is_object ( $node ) ) ? xml2array ( $node ) : $node;

Answer 1

You can use array_reduce. It takes three arguments, an initial array to operate on, a function which should operate on each element (which in turn requires two arguments, $carry, which is a variable that gets passed through to the function each time through the return statement, and $item, which is the array item being operated on) and finally an "initial" value for $carry within the function, which in this case is going to be our multidimensional array that gets eventually returned.

This is an example where the Finder function returns a key based on whether the value of the items in the array is odd or even, and sorts the values accordingly.

Note that we are operating on the array_keys of fruits, so that we have access to both key and value inside our reducer.

<?php

$fruit = ['apple' => 11, 'pear' => 5, 'banana' => 3, 'cucumber' => 2, 'tomatoes' => 8];

function Finder($fruit) {
    return $fruit % 2 == 0 ? 'even' : 'odd';
}

$multi = array_reduce(array_keys($fruit), function($carry, $item) use ($fruit) {
    $val = $fruit[$item];
    $carry[Finder($val)][$item] = $val;
    return $carry;
}, []);

var_dump($multi);

/* // output
array(2) {
  ["odd"]=>
  array(3) {
    ["apple"]=>
    int(11)
    ["pear"]=>
    int(5)
    ["banana"]=>
    int(3)
  }
  ["even"]=>
  array(2) {
    ["cucumber"]=>
    int(2)
    ["tomatoes"]=>
    int(8)
  }
}
*/