Write a PHP program to create a new string using two given strings s1, s2, the format of the new string will be s1s2s2s1

hamza

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2022-05-18

141

Php programming,

hamza

2022-05-18

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<?php
function test($s1, $s2)
{
    return $s1 . $s2 . $s2 . $s1;
}

echo test("Hi", "Hello")."\n";
echo test("whats", "app");

Sample Output:

HiHelloHelloHi
whatsappappwhats

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