我正在使用PHPExcel 1.8.0
我已阅读有关循环引用的帖子，例如this one，但我仍遇到问题。
以下是我到目前为止所做的细节。
假设电子表格中A1 = B1且B1 = A1 + 1，Excel设置为100次迭代。这是我的代码：
// create reader
$objReader = PHPExcel_IOFactory::createReader('Excel2007');
$objReader->setReadDataOnly(true);
// load workbook
$objPHPExcel = $objReader->load($this->_path);
// set iterative calculations max count
PHPExcel_Calculation::getInstance($objPHPExcel)->cyclicFormulaCount = 100;
// calculate
$objWorksheet = $objPHPExcel->getSheetByName('Testing');
$data = $objWorksheet->rangeToArray('A1:B1');
echo '<pre>';
print_r ($data);
echo '</pre>';
// release resources
$objPHPExcel->disconnectWorksheets();
unset($objPHPExcel);
MSExcel导致A1 = 99，B1 = 100.我的代码生成：
Array
(
[0] => Array
(
[0] => #VALUE!
[1] => #VALUE!
)
)
除此之外，如果我添加A2 = B2和B2 = A2 + 1，并尝试计算（A1：B2），它会进入无限循环并最终崩溃：
致命错误：第2837行的C：\ xampp \ htdocs \ cgc \ bulldog \ application \ third_party \ PHPExcel \ Calculation.php中允许的内存大小为134217728（已尝试分配24个字节）
这是我到目前为止所做的。在Calculation.php中的_calculateFormulaValue中：
第2383行：$cellValue = ''; - 这是#Value的原因！错误。我将其更改为$cellValue = 0;
第2400行：
} elseif ($this->_cyclicFormulaCell == '') {
$this->_cyclicFormulaCell = $wsTitle.'!'.$cellID;
这是无限循环的原因。在第1行中的公式完成后，$ this-＆gt; _cyclicFormulaCell不会重新设置为''，因此此条件不适用于第2行中的公式。
我从第2389行开始修复如下：
if (($wsTitle{0} !== "\x00") && ($this->_cyclicReferenceStack->onStack($wsTitle.'!'.$cellID))) {
if ($this->cyclicFormulaCount <= 0) {
return $this->_raiseFormulaError('Cyclic Reference in Formula');
} elseif (($this->_cyclicFormulaCount >= $this->cyclicFormulaCount) &&
($this->_cyclicFormulaCell == $wsTitle.'!'.$cellID)) {
// Olga - reset for next formula
$this->_cyclicFormulaCell = '';
return $cellValue;
} elseif ($this->_cyclicFormulaCell == $wsTitle.'!'.$cellID) {
++$this->_cyclicFormulaCount;
if ($this->_cyclicFormulaCount >= $this->cyclicFormulaCount) {
// Olga - reset for next formula
$this->_cyclicFormulaCell = '';
return $cellValue;
}
} elseif ($this->_cyclicFormulaCell == '') {
$this->_cyclicFormulaCell = $wsTitle.'!'.$cellID;
if ($this->_cyclicFormulaCount >= $this->cyclicFormulaCount) {
// Olga - reset for next formula
$this->_cyclicFormulaCell = '';
return $cellValue;
}
}
完成这些修复后，如果我运行$data = $objWorksheet->rangeToArray('A1:B2');，我会得到以下结果：
Array
(
[0] => Array
(
[0] => 100 // should be 99
[1] => 100
)
[1] => Array
(
[0] => 100 // should be 99
[1] => 100
)
)
如您所见，PHPExcel的结果与MS Excel不一致。为什么会发生这种情况？我该如何解决这个问题？
答案 0 :(得分：1)
好的，我设法调试了这个。我的电子表格非常复杂，有很多循环引用。最具挑战性的是A取决于B，B取决于A和C，C取决于B的情况。
我还添加了一个maxChange参数，所以这个东西就像Excel一样。否则我的电子表格需要很长时间。
无论如何，这是一个用法示例：
$objPHPExcel = PHPExcel_IOFactory::load($path);
$objCalc = PHPExcel_Calculation::getInstance($objPHPExcel);
$objCalc->cyclicFormulaCount = 100;
$objCalc->maxChange = 0.001;
修改后的两个文件是：Calculation.php和CalcEngine / CyclicReferenceStack.php
这是代码（抱歉Mark，我无法再有足够的时间将其提交给git）。
将这些添加到类属性中：
private $_precedentsStack = array();
public $maxChange = 0;
将_calculateFormulaValue（）函数替换为：
public function _calculateFormulaValue($formula, $cellID=null, PHPExcel_Cell $pCell = null) {
$this->_debugLog->writeDebugLog("BREAKPOINT: _calculateFormulaValue for $cellID");
// Basic validation that this is indeed a formula
// We simply return the cell value if not
$formula = trim($formula);
if ($formula{0} != '=') return self::_wrapResult($formula);
$formula = ltrim(substr($formula,1));
if (!isset($formula{0})) return self::_wrapResult($formula);
// initialize values
$pCellParent = ($pCell !== NULL) ? $pCell->getWorksheet() : NULL;
$wsTitle = ($pCellParent !== NULL) ? $pCellParent->getTitle() : "\x00Wrk";
$key = $wsTitle.'!'.$cellID;
$data = array(
'i' => 0, // incremented when the entire stack has been calculated
'j' => 0, // flags the formula as having been calculated; can only be 0 or 1
'cellValue' => $pCell->getOldCalculatedValue(), // default value to start with
'precedents' => array(),
'holdValue' => FALSE // set to TRUE when change in value is less then maxChange
);
// add this as precedent
$this->_precedentsStack[] = $key;
// if already been calculated, return cached value
if (($cellID !== NULL) && ( $this->getValueFromCache($wsTitle, $cellID, $cellValue))) {
return $cellValue;
}
$this->_cyclicReferenceStack->getValueByKey($key, $data);
extract($data);
$this->_debugLog->writeDebugLog("iteration # $i");
// if already calculated in this iteration, return the temp cached value
if ($i >= $this->cyclicFormulaCount || $j == 1) {
return $cellValue;
}
// on stack, but has not yet been calculated => return default value
if (($wsTitle{0} !== "\x00") && ($this->_cyclicReferenceStack->onStack($key))) {
if ($this->cyclicFormulaCount <= 0) {
return $this->_raiseFormulaError('Cyclic Reference in Formula');
}
return $cellValue;
}
// calculate value recursively
$this->_cyclicReferenceStack->push($key);
$cellValue = $this->_processTokenStack($this->_parseFormula($formula, $pCell), $cellID, $pCell);
$this->_cyclicReferenceStack->pop();
// everything in precedent stack after the current cell is a precedent
// and every precedent's precedent is a precedent (aka a mouthfull)
while ( $this->_precedentsStack[ count($this->_precedentsStack) - 1 ] != $key ){
$data['precedents'][] = array_pop($this->_precedentsStack);
}
$data['precedents'] = array_unique($data['precedents']);
// check for max change
$oldValue = $this->_extractResult($data['cellValue']);
$newValue = $this->_extractResult($cellValue);
$data['cellValue'] = $cellValue;
$data['holdValue'] = (abs($oldValue - $newValue) < $this->maxChange);
// flag as calculated and save to temp storage
$data['j'] = 1;
$this->_cyclicReferenceStack->setValueByKey($key, $data);
// if this cell is a precedent, trigger a re-calculate
$tempCache = $this->_cyclicReferenceStack->showValues();
foreach ($tempCache as $tempKey => $tempData) {
if ( $tempData['holdValue'] == TRUE && ( in_array($key, $tempData['precedents'])) ) {
$tempData['holdValue'] = FALSE;
}
$this->_cyclicReferenceStack->setValueByKey($tempKey, $tempData);
}
// at the end of the stack, increment the counter and flag formulas for re-calculation
if (count($this->_cyclicReferenceStack->showStack()) == 0) {
$i++;
$this->_precedentsStack = array();
$tempCache = $this->_cyclicReferenceStack->showValues();
foreach ($tempCache as $tempKey => $tempData) {
$tempData['i'] = $i;
if ( ! $tempData['holdValue'] ) $tempData['j'] = 0;
$this->_cyclicReferenceStack->setValueByKey($tempKey, $tempData);
}
$this->_debugLog->writeDebugLog("iteration # $i-1 finished");
}
if ($i < $this->cyclicFormulaCount) {
$cellValue = $this->_calculateFormulaValue($pCell->getValue(), $cellID, $pCell);
} elseif ($cellID !== NULL) {
// all done: move value from temp storage to cache
$this->saveValueToCache($wsTitle, $cellID, $cellValue);
$this->_cyclicReferenceStack->removeValueByKey($key);
}
// Return the calculated value
return $cellValue;
} // function _calculateFormulaValue()
添加此辅助函数：
private function _extractResult($result) {
if (is_array($result)) {
while (is_array($result)) {
$result = array_pop($result);
}
}
return $result;
}
添加一个属性：
private $_values = array();
添加一堆功能：
public function setValueByKey($key, $value) {
$this->_values[$key] = $value;
}
public function getValueByKey($key, &$value) {
if (isset($this->_values[$key])) {
$value = $this->_values[$key];
return true;
}
return false;
}
public function removeValueByKey($key) {
if (isset($this->_values[$key])) {
unset($this->_values[$key]);
}
}
public function showValues() {
return $this->_values;
}