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<?php
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function single_number($arr)
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{
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$result = 0;
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for($i=0; $i<sizeof($arr); $i++)
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{
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$result = $result ^ $arr[$i];
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}
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return $result;
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}
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$num = array(5, 3, 0, 3, 0, 5, 7, 7, 9);
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print_r(single_number($num)."\n")
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?>
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