PHPCfg\Op::getVariableNames PHP Method

    public abstract function getVariableNames();

 private function dumpOp(Op $op)
 {
     $result = $op->getType();
     foreach ($op->getVariableNames() as $varName) {
         $result .= "\n    {$varName}: ";
         $result .= $this->indent($this->dumpOperand($op->{$varName}));
     }
     foreach ($op->getSubBlocks() as $subBlock) {
         $result .= "\n    {$subBlock}: " . $this->indent($this->dumpBlockRef($op->{$subBlock}));
     }
     return $result;
 }