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实现单操作符简单公式解析

时间：2021-07-01 10:21:17 帮助过：19人阅读

<无详细内容>
  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<$nums;$i++){
  57. if(!is_numeric($array[$i])){
  58. $pos[] = $i;
  59. }
  60. }
  61. return $pos;
  62. }
  63. private function getdividepos(){
  64. $array = $this->getDataarray();// ||$expressionarray
  65. $pos = array();
  66. $nums = sizeof($array);
  67. for ($i=0;$i<$nums;$i++){
  68. if($array[$i]=="/"){
  69. $pos[] = $i;
  70. }
  71. }
  72. return $pos;
  73. }
  74. private function iszero(){
  75. $dataarray = $this->getDataarray();
  76. //print_r($dataarray);
  77. $array = $this->getdividepos(); // ||$devidpos
  78. //print_r($array);
  79. $nums = sizeof($array);
  80. echo "
    iszero nums:".$nums."
    ";
  81. if ($nums==0){
  82. $this->setResult(1);
  83. }else{
  84. for ($i=0;$i<$nums;$i++){
  85. $key = $array[$i]+1;
  86. //$key = $i + 1;
  87. echo "
    key :$key
    ";
  88. //echo "data:".$dataarray[$key];
  89. $data = (int)($dataarray[$key]);
  90. echo "data:".$data."
    ";
  91. if ($data==0){
  92. $this->setResult(0);
  93. }
  94. else {
  95. $this->setResult($data);
  96. }
  97. }
  98. }
  99. }
  101. public function main(){
  102. $this->stringtoarray();
  103. $dataarray = $this->getDataarray(); //array("#data_1","/","#data_2");
  104. print_r($dataarray);
  105. $dividepos = $this->iszero();
  106. $result = $this->getResult();
  107. echo "reslut:".$result."
    ";
  108. if($result==0){
  109. return 0;
  110. }else{
  111. $operatepos = $this->getpos($dataarray);
  112. $nums = sizeof($operatepos);
  113. for($i=0;$i<$nums;$i++){
  114. $pos = $operatepos[$i];
  115. $operate = $dataarray[$pos];
  116. echo "operate:".$operate."
    ";
  117. switch ($operate){
  118. case "+":
  119. $key1 = $pos - 1;
  120. $key2 = $pos + 1;
  121. $data_1 = $dataarray[$key1];
  122. $data_2 = $dataarray[$key2];
  123. $tempdata = $this->add($data_1, $data_2);
  124. return $tempdata;
  125. case "-":
  126. $key1 = $pos - 1;
  127. $key2 = $pos + 1;
  128. $data_1 = $dataarray[$key1];
  129. $data_2 = $dataarray[$key2];
  130. $tempdata = $this->minus($data_1, $data_2);
  131. return $tempdata;
  132. case "*":
  133. $key1 = $pos - 1;
  134. $key2 = $pos + 1;
  135. $data_1 = $dataarray[$key1];
  136. $data_2 = $dataarray[$key2];
  137. $tempdata = $this->multiply($data_1, $data_2);
  138. return $tempdata;
  139. case "/":
  140. $key1 = $pos - 1;
  141. $key2 = $pos + 1;
  142. $data_1 = $dataarray[$key1];
  143. $data_2 = $dataarray[$key2];
  144. $tempdata = $this->divide($data_1, $data_2);
  145. return $tempdata;
  146. }
  149. }
  151. }
  154. }
  157. }
  160. $data_3 = "2 * 3";
  161. $compute = new operate();
  162. $compute ->setParams($data_3);
  163. echo "result:".$compute->main();

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