Array_diff not excluding elements from array

Question

I am attempting to use array_diff to exclude certain elements from an array. According to the docs: "Returns an array containing all the entries from array1 that are not present in any of the other arrays."

In my code below I have an array which represents the data return from the database when requesting a user. I have another array which contains the elements I don't want to be included in the array. Here is the code ...

$user = array(
    'id' => '9',
    'password' => 'CRYPT_BLOWFISH HASH',
    'username' => 'Billy',
    'phone' => '+447777777777');

$columnsToExclude = array('password', 'phone');

var_dump(array_diff($user, $columnsToExclude));

I'm not understanding what I'm doing wrong, unless I can't use a sequential array as the second argument.

What am I doing wrong?

Edit:

As suggested in comments, I have tried array_diff_key and I get the same results.

array_diff_key($user, $columnsToExclude));

Try array_diff_key php.net/manual/en/function.array-diff-key.php — Niols
– Niols, Commented Mar 3, 2015 at 16:15

deceze · Accepted Answer · 2015-03-03 16:19:27Z

2

array_diff returns all your values from $user which do not have matching values in $columnsToExclude. The values in $columnsToExclude are "password" and "phone". None of these values exist in $user. The result is expected. You want to do this diff on the keys, and you also need to make "password" and "phone" keys in the array, not values:

array_diff_key($users, array_flip($columnsToExclude))

answered Mar 3, 2015 at 16:19

deceze♦

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