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What is the output of the following code? function fibonacci (&$x1 = 0, &$x2 = 1) { $result = $x1 + $x2; $x1 = $x2; $x2 = $result; return $result; } for ($i = 0; $i < 10; $i++) { echo fibonacci() . ','; }

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What is the output of the following code? function fibonacci (&$x1 = 0, &$x2 = 1) { $result = $x1 + $x2; $x1 = $x2; $x2 = $result; return $result; } for ($i = 0; $i < 10; $i++) { echo fibonacci() . ','; }






 
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