Check if arrays inside another array have same element

Question

It shouldn't be allowed same emails within array:

[
 ["first" => "John", "last" => "Snow","email" => "[email protected]"],
 ["first" => "Sansa","last" => "Stark","email" => "[email protected]"],
 ["first" => "Rob","last" => "Stark","email" => "[email protected]"]
]

There can be unlimited number of elements of array type within outer array. Should I iterate with foreach and have some temp variable in which I am going to write email or is there a more efficient way?

What is the expected output and what are the different cases possible? — mighty_dev
– mighty_dev, Commented Jun 10, 2019 at 10:17
I just want to display error that two same emails are in array — niksrb
– niksrb, Commented Jun 10, 2019 at 10:19
@AlivetoDie it is being created using javascript, and sent back to server, where I have to json decode it and then check for double values, and return true/false. That's why I can't do anything at the time of creation. — niksrb
– niksrb, Commented Jun 10, 2019 at 10:21
You need JS validation, but better to have it on server side as well. — mighty_dev
– mighty_dev, Commented Jun 10, 2019 at 10:24

Nigel Ren · Accepted Answer · 2019-06-10 10:24:23Z

3

You can simple check that the count of the original array elements isn't equal to the count of the unique email addresses (done using array_column() and array_unique()).

if ( count($data) != count(array_unique(array_column($data, "email"))) )    {
    echo "Multiple";
}

(Assuming array is in $data).

Or for just true/false...

echo count($data) != count(array_unique(array_column($data, "email")));

answered Jun 10, 2019 at 10:24

Nigel Ren

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