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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\Engine;
class CyclicReferenceStack
{
/**
* The call stack for calculated cells.
*
* @var mixed[]
*/
private $stack = [];
* Return the number of entries on the stack.
* @return int
public function count()
return count($this->stack);
}
* Push a new entry onto the stack.
* @param mixed $value
public function push($value)
$this->stack[$value] = $value;
* Pop the last entry from the stack.
* @return mixed
public function pop()
return array_pop($this->stack);
* Test to see if a specified entry exists on the stack.
* @param mixed $value The value to test
public function onStack($value)
return isset($this->stack[$value]);
* Clear the stack.
public function clear()
$this->stack = [];
* Return an array of all entries on the stack.
* @return mixed[]
public function showStack()
return $this->stack;
PHPOffice /
PhpSpreadsheet
