PHP Cleaning up nested arrays with unknown structure

Question

Let's assume I have an array like so:

[1=>[1=>2,2=>"something"],2=>[1,2],3=>"hello"]

The array has a "unorganized" structure with subarrays other values.

I want to run a htmlentities function on each value to make sure nothing bad is inside the values.

I've been reading up on RecursiveIteratorIterator but I cannot find an example of how to use it to apply a function to each value in a quite random nested multidimensional array. Any help is appreciated.

Jeto · Accepted Answer · 2019-02-03 00:13:06Z

2

You could simply make use of array_walk_recursive:

array_walk_recursive($input, function (&$value) {
  $value = htmlentities($value);
});

Demo: https://3v4l.org/QmRJr

edited Feb 3, 2019 at 0:13

answered Feb 3, 2019 at 0:08

Jeto

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2 Comments

Maciek Over a year ago

Also, can I just write array_walk_recursive($input,'htmlentities') ?

Jeto Over a year ago

@MatthewSemik Unfortunately not, because the return value of the callback doesn't matter in that case (contrary to array_map for instance). You have to change the value itself, hence the & before the parameter.

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