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【
PHP
】
实现单操作符简单公式解析
作者:
yuanzhigang
/ 发布于
2012/8/3
/
535
实现单操作符简单公式解析
<div><?php $string = "#data_1 / #data_2"; class operate{ private $params; private $dataarray; private $result; private function getResult() { return $this->result; } <div>private function setResult($result) { $this->result = $result; } <div>private function getDataarray() { return $this->dataarray; } <div>private function setDataarray($dataarray) { $this->dataarray = $dataarray; } <div>private function getParams() { return $this->params; } <div>public function setParams($params) { $this->params = $params; } <div>private function add($data_1,$data_2){ return $data_1+$data_2; } private function minus($data_1,$data_2){ return $data_1-$data_2; } private function multiply($data_1,$data_2){ return $data_1*$data_2; } <div>private function divide($data_1,$data_2){ return $data_1/$data_2; } private function stringtoarray(){ $params = $this->getParams(); $dataarray = explode(" ", $params); $this->setDataarray($dataarray); } private function getpos($array){ $pos = array(); $nums = sizeof($array); for ($i=0;$i<$nums;$i++){ if(!is_numeric($array[$i])){ $pos[] = $i; } } return $pos; } private function getdividepos(){ $array = $this->getDataarray();// ||$expressionarray $pos = array(); $nums = sizeof($array); for ($i=0;$i<$nums;$i++){ if($array[$i]=="/"){ $pos[] = $i; } } return $pos; } private function iszero(){ $dataarray = $this->getDataarray(); //print_r($dataarray); $array = $this->getdividepos(); // ||$devidpos //print_r($array); $nums = sizeof($array); echo "iszero nums:".$nums.""; if ($nums==0){ $this->setResult(1); }else{ for ($i=0;$i<$nums;$i++){ $key = $array[$i]+1; //$key = $i + 1; echo "key :$key"; //echo "data:".$dataarray[$key]; $data = (int)($dataarray[$key]); echo "data:".$data.""; if ($data==0){ $this->setResult(0); } else { $this->setResult($data); } } } } public function main(){ $this->stringtoarray(); $dataarray = $this->getDataarray(); //array("#data_1","/","#data_2"); print_r($dataarray); $dividepos = $this->iszero(); $result = $this->getResult(); echo "reslut:".$result.""; if($result==0){ return 0; }else{ $operatepos = $this->getpos($dataarray); $nums = sizeof($operatepos); for($i=0;$i<$nums;$i++){ $pos = $operatepos[$i]; $operate = $dataarray[$pos]; echo "operate:".$operate.""; switch ($operate){ case "+": $key1 = $pos - 1; $key2 = $pos + 1; $data_1 = $dataarray[$key1]; $data_2 = $dataarray[$key2]; $tempdata = $this->add($data_1, $data_2); return $tempdata; case "-": $key1 = $pos - 1; $key2 = $pos + 1; $data_1 = $dataarray[$key1]; $data_2 = $dataarray[$key2]; $tempdata = $this->minus($data_1, $data_2); return $tempdata; case "*": $key1 = $pos - 1; $key2 = $pos + 1; $data_1 = $dataarray[$key1]; $data_2 = $dataarray[$key2]; $tempdata = $this->multiply($data_1, $data_2); return $tempdata; case "/": $key1 = $pos - 1; $key2 = $pos + 1; $data_1 = $dataarray[$key1]; $data_2 = $dataarray[$key2]; $tempdata = $this->divide($data_1, $data_2); return $tempdata; } } } } } <div> $data_3 = "2 * 3"; $compute = new operate(); $compute ->setParams($data_3); echo "result:".$compute->main(); </div>
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yuanzhigang
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实现单操作符简单公式解析
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