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Language/Type: PHP string

Given the following variable declarations:

// index       0123456789012345678901234
$s1         = "Snoop Dogg";
$s2         = "Marshall 'Eminem' Mathers";
$s3         = $s2.substr(18);
$book       = "Art & Science of PHP";

Give the results of the following expressions. Make sure to indicate a value of the proper type (e.g. strings in " " quotes).

strpos($s1, "o")
strpos($s2, "x")
substr($s1, 6, 9)
substr($s2, 21)
substr($book, 6, 12)

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