$_writeDebugLog
$_writeDebugLog : bool
Flag to determine whether a debug log should be generated by the calculation engine If true, then a debug log will be generated If false, then a debug log will not be generated
PHPExcel_CalcEngine_Logger
$_writeDebugLog : bool
Flag to determine whether a debug log should be generated by the calculation engine If true, then a debug log will be generated If false, then a debug log will not be generated
$_echoDebugLog : bool
Flag to determine whether a debug log should be echoed by the calculation engine If true, then a debug log will be echoed If false, then a debug log will not be echoed A debug log can only be echoed if it is generated
$_debugLog : string[]
The debug log generated by the calculation engine
$_cellStack : \PHPExcel_CalcEngine_CyclicReferenceStack
The calculation engine cell reference stack
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