Implement simple formula parsing of single operator

<无详细内容> $string = "#data_1/#data_2"; Class operate{ Private $params; Private $dataarray; Private $result; Private Function GetResult () { return $this->result; } Private Function Setresult ($result) { $this->result = $result; } Private Function Getdataarray () { return $this->dataarray; } Private Function Setdataarray ($dataarray) { $this->dataarray = $dataarray; } Private Function Getparams () { return $this->params; } Public Function SetParams ($params) { $this->params = $params; } Private function Add ($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* $data _2; } Private function Divide ($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 "+": $key 1 = $pos-1; $key 2 = $pos + 1; $data _1 = $dataarray [$key 1]; $data _2 = $dataarray [$key 2]; $tempdata = $this->add ($data _1, $data _2); return $tempdata; Case "-": $key 1 = $pos-1; $key 2 = $pos + 1; $data _1 = $dataarray [$key 1]; $data _2 = $dataarray [$key 2]; $tempdata = $this->minus ($data _1, $data _2); return $tempdata; Case "*": $key 1 = $pos-1; $key 2 = $pos + 1; $data _1 = $dataarray [$key 1]; $data _2 = $dataarray [$key 2]; $tempdata = $this->multiply ($data _1, $data _2); return $tempdata; Case "/": $key 1 = $pos-1; $key 2 = $pos + 1; $data _1 = $dataarray [$key 1]; $data _2 = $dataarray [$key 2]; $tempdata = $this->divide ($data _1, $data _2); return $tempdata; } } } } } $data _3 = "2 * 3"; $compute = new operate (); $compute->setparams ($data _3); echo "Result:". $compute->main (); Copy Code

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