PHP multidimentional array has all subarrays of another multidimentional array

Question

What is the best way to make sure that array $b has all the subarrays from $a despite the numeric keys (0,1,2.. etc)

$a = [
    0 => ['v' => 1, 'f' => 2],
    1 => ['v' => 144, 'f' => 443]
];

$b = [
    0 => ['v' => 1, 'f' => 2],
    1 => ['v' => 25, 'f' => 3],
    2 => ['v' => 144, 'f' => 443]
];

My approach with foreach inside foreach inside foreach and multiple ifs... quickly becomes a mess.

Nigel Ren · Accepted Answer · 2020-04-26 11:16:52Z

2

There is array_diff(), unfortunately this only works with 1 dimension. But you can json_encode() each element of the array and compare that...

$c = array_diff(array_map("json_encode", $a), array_map("json_encode", $b));

print_r($c);

With your original data, as they are all in the second array, this gives...

Array
(
)

Change the 443 to 4431

$a = [
    0 => ['v' => 1, 'f' => 2],
    1 => ['v' => 144, 'f' => 4431]
];

and you get...

Array
(
    [1] => {"v":144,"f":4431}
)

The key will be the same as the original, but the data is JSON encoded (if that really matters).

answered Apr 26, 2020 at 11:16

Nigel Ren

57.3k11 gold badges49 silver badges59 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Mahesh Shrestha · Accepted Answer · 2020-04-26 11:17:58Z

0

You can use intersection in this case.

$a = [
    0 => ['v' => 1, 'f' => 2],
    1 => ['v' => 144, 'f' => 443]
];

$b = [
    0 => ['v' => 1, 'f' => 2],
    1 => ['v' => 25, 'f' => 3],
    2 => ['v' => 144, 'f' => 443]
];
$result = array_intersect($a, $b);
if($result == $a){
  echo '$b has all the value in $a';
}

answered Apr 26, 2020 at 11:17

Mahesh Shrestha

111 bronze badge

2 Comments

Nigel Ren Over a year ago

This gives loads of Notice: Array to string conversion messages.

Mahesh Shrestha Over a year ago

yes did not test before posting. The code should be $a = [ 0 => ['v' => 1, 'f' => 2], 1 => ['v' => 144, 'f' => 443] ]; $b = [ 0 => ['v' => 1, 'f' => 2], 1 => ['v' => 25, 'f' => 3], 2 => ['v' => 144, 'f' => 443] ]; $result = array_uintersect($a, $b, 'compareDeepValue'); if($result == $a){ echo '$b has all the value in $a'; } function valueCompare($val1, $val2) { return strcmp($val1['v'], $val2['v']) && strcmp($val1['f'], $val2['f']); }

Collectives™ on Stack Overflow

PHP multidimentional array has all subarrays of another multidimentional array

2 Answers 2

Comments

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related