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Translation to PHP, from the answer posted ny Dan McGrath.
rand7function Rand7(){$x=8;while($x>7)$x=rand5()+5*rand5()-5;return $x;}
5867 characters.
rand7(){$x=8;while($x>7)$x=rand5()+5*rand5()-5;return $x;}
58 characters.
function Rand7(){$x=8;while($x>7)$x=rand5()+5*rand5()-5;return $x;}
67 characters.
