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differencia([1, 2, 3], [1, 2, 4]) # [3, 4]

differencia([], [1, 2, 4]) # [1, 2, 4]

differencia([1, 2, 4], []) # [1, 2, 4]

differencia(["a", "b", "c"], ["b", "a", "d"]) # ['c', 'd']

duplicate_encode("din"); // (((

duplicate_encode("recede"); // ()()()

duplicate_encode("Success"); // )())())

duplicate_encode("(( @"); // ))((

hasDuplicates([1, 2, 3, 4, 5, 5]); // true

hasDuplicates([1, 2, 3, 4, 5, 6]); // false

$a2 = ["lively", "alive", "harp", "sharp", "armstrong"];

$a1 = ["arp", "live", "strong"];

inArray($a1, $a2); // ["arp", "live", "strong"]

$a1 = ["xyz", "live", "strong"];

inArray($a1, $a2); // ["live", "strong"]

$a1 = ["live", "strong", "arp"];

inArray($a1, $a2); // ["arp", "live", "strong"]

$a1 = [];

inArray($a1, $a2); // []

| Card Type  | Begins With          | Number Length |

|------------|----------------------|---------------|

| AMEX       | 34 or 37             | 15            |

| Discover   | 6011                 | 16            |

| Mastercard | 51, 52, 53, 54 or 55 | 16            |

| VISA       | 4                    | 13 or 16      |

getIssuer(4111111111111111); // == "VISA"

getIssuer(4111111111111); // == "VISA"

getIssuer(4012888888881881); // == "VISA"

getIssuer(378282246310005); // == "AMEX"

getIssuer(6011111111111117); // == "Discover"

getIssuer(5105105105105100); // == "Mastercard"

getIssuer(5105105105105106); // == "Mastercard"

getIssuer(9111111111111111); // == "Unknown"

maskify("4556364607935616"); // '############5616'

maskify("64607935616"); // '#######5616'

maskify("1"); // '1'

maskify(""); // ''

$string="     El\n  sol\n   brilla";

removeSpacePrevLines($string); // "   El\nsol\n brilla";

$string="  El\n   sol\n  brilla";

removeSpacePrevLines($string); // "El\n sol\nbrilla";

$cadena="El      \nsol  \nbrilla   ";

removeSpaceEndLines($cadena); // "El\nsol\nbrilla"