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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/ 510

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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