Remove elements from array where the numeric value contains the same digit more than once

Question

I want to remove the numbers from array which have repeated digits in them.

array('4149','8397','9652','4378','3199','7999','8431','5349','7068');

to

array('8397','9652','4378','8431','5349','7068');

I have tried this thing

foreach($array as $key => $value) {
    $data = str_split($value, 1);
    $check = 0;
    foreach($data as $row => $element) {
        $check = substr_count($value, $element);
        if($check != 1) {
            array_diff($array, array($value));
        }
   }
}

Answer 1

You can filter the array using a regular expression that matches:

• (.) any character
• .* followed by zero or more characters
• \1 followed by the first character one more time

Example code:

$array = array('4149','8397','9652','4378','3199','7999','8431','5349','7068');

$result = array_filter(
    $array,
    function ($number) {
        return !preg_match('/(.).*\\1/', $number);
    }
);

echo implode(', ', $result), PHP_EOL;

Output:

8397, 9652, 4378, 8431, 5349, 7068