实现单操作符简单公式解析

1. $string = "#data_1 / #data_2";
2. class operate{
3. private $params;
4. private $dataarray;
5. private $result;
6. private function getResult() {
7. return $this->result;
8. }
10. private function setResult($result) {
11. $this->result = $result;
12. }
14. private function getDataarray() {
15. return $this->dataarray;
16. }
18. private function setDataarray($dataarray) {
19. $this->dataarray = $dataarray;
20. }
22. private function getParams() {
23. return $this->params;
24. }
26. public function setParams($params) {
27. $this->params = $params;
28. }
30. private function add($data_1,$data_2){
31. return $data_1+$data_2;
32. }
33. private function minus($data_1,$data_2){
34. return $data_1-$data_2;
35. }
36. private function multiply($data_1,$data_2){
37. return $data_1*$data_2;
38. }
40. private function divide($data_1,$data_2){
42. return $data_1/$data_2;
44. }
45. private function stringtoarray(){
46. $params = $this->getParams();
47. $dataarray = explode(" ", $params);
48. $this->setDataarray($dataarray);
50. }
52. private function getpos($array){
54. $pos = array();
55. $nums = sizeof($array);
56. for ($i=0;$i if(!is_numeric($array[$i])){
57. $pos[] = $i;
58. }
59. }
60. return $pos;
61. }
62. private function getdividepos(){
63. $array = $this->getDataarray();// ||$expressionarray
64. $pos = array();
65. $nums = sizeof($array);
66. for ($i=0;$i if($array[$i]=="/"){
67. $pos[] = $i;
68. }
69. }
70. return $pos;
71. }
72. private function iszero(){
73. $dataarray = $this->getDataarray();
74. //print_r($dataarray);
75. $array = $this->getdividepos(); // ||$devidpos
76. //print_r($array);
77. $nums = sizeof($array);
78. echo "
    iszero nums:".$nums."
    ";
79. if ($nums==0){
80. $this->setResult(1);
81. }else{
82. for ($i=0;$i $key = $array[$i]+1;
83. //$key = $i + 1;
84. echo "
    key :$key
    ";
85. //echo "data:".$dataarray[$key];
86. $data = (int)($dataarray[$key]);
87. echo "data:".$data."
    ";
88. if ($data==0){
89. $this->setResult(0);
90. }
91. else {
92. $this->setResult($data);
93. }
94. }
95. }
96. }
98. public function main(){
99. $this->stringtoarray();
100. $dataarray = $this->getDataarray(); //array("#data_1","/","#data_2");
101. print_r($dataarray);
102. $dividepos = $this->iszero();
103. $result = $this->getResult();
104. echo "reslut:".$result."
     ";
105. if($result==0){
106. return 0;
107. }else{
108. $operatepos = $this->getpos($dataarray);
109. $nums = sizeof($operatepos);
110. for($i=0;$i $pos = $operatepos[$i];
111. $operate = $dataarray[$pos];
112. echo "operate:".$operate."
     ";
113. switch ($operate){
114. case "+":
115. $key1 = $pos - 1;
116. $key2 = $pos + 1;
117. $data_1 = $dataarray[$key1];
118. $data_2 = $dataarray[$key2];
119. $tempdata = $this->add($data_1, $data_2);
120. return $tempdata;
121. case "-":
122. $key1 = $pos - 1;
123. $key2 = $pos + 1;
124. $data_1 = $dataarray[$key1];
125. $data_2 = $dataarray[$key2];
126. $tempdata = $this->minus($data_1, $data_2);
127. return $tempdata;
128. case "*":
129. $key1 = $pos - 1;
130. $key2 = $pos + 1;
131. $data_1 = $dataarray[$key1];
132. $data_2 = $dataarray[$key2];
133. $tempdata = $this->multiply($data_1, $data_2);
134. return $tempdata;
135. case "/":
136. $key1 = $pos - 1;
137. $key2 = $pos + 1;
138. $data_1 = $dataarray[$key1];
139. $data_2 = $dataarray[$key2];
140. $tempdata = $this->divide($data_1, $data_2);
141. return $tempdata;
142. }
145. }
147. }
150. }
153. }
156. $data_3 = "2 * 3";
157. $compute = new operate();
158. $compute ->setParams($data_3);
159. echo "result:".$compute->main();

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