Set Array Equal to Another Array without Specified Key/Values

Question

I am attempting to mirror the behavior of newArray = oldArray, with the caveat of excluding some key/values of the oldArray, so something like newArray = oldArray - undesiredOldKeyValue. I realize this is fully doable with a foreach on the oldArray and using an if to see if the encountered key is desired or not, but I am interested in a simpler or more concise approach if possible.

A couple of things to keep in mind, I need to exclude key/value pairs based on key, not value. I do not want to modify the oldArray in the process of doing this.

See [`array_filter()`](http://us3.php.net/manual/en/function.array-filter.php). — Alex Howansky, Jul 10 '17 at 14:50

rap-2-h · Accepted Answer · 2017-07-10T14:55:38.960

0

You may try to use array_filer. Something like:

$new_array = array_filter($old_array, function ($value, $key) {
    // return false if you don't want a value, true if you want it.
    // Example 1: `return $value != 'do not keep this one';`
    // Example 2: `return !in_array($key, ['unwanted-key1', 'unwanted-key2', 'etc']);`
}, ARRAY_FILTER_USE_BOTH);

It will filters elements of an array using a callback function.

edited Jul 10 '17 at 14:55

answered Jul 10 '17 at 14:51

rap-2-h

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`return ! in_array($key, ['undesired-key1', 'undesired-key2', 'etc']);` – axiac Jul 10 '17 at 14:52
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The call to [`array_filter()`](http://php.net/manual/en/function.array-filter.php) needs a third argument in order to also pass the keys to the callback. – axiac Jul 10 '17 at 14:54
@axiac thanks, I added two examples! – rap-2-h Jul 10 '17 at 14:54
@axiac haha thanks again!! – rap-2-h Jul 10 '17 at 14:55

Set Array Equal to Another Array without Specified Key/Values

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