php版的求表达式的真值表-TrueValueTable

时间：2022-03-16 04:18:38

php版的求表达式的真值表-TrueValueTable

贴上代码：

<?php

    error_reporting(E_ALL & ~E_NOTICE);

    $expression=$_GET['TrueTable'];    //读取输入框数据

    if(!empty($_GET['TrueTable'])){

        $expression=strtoupper($expression);   //将输入的小写字母，替代成大写字母

        $expressionArr=str_split($expression); //将$expression转换成数组

        foreach($expressionArr as $v){         //把字母放在 $varTotal数组中

            if($v>='A' && $v<='Z'){

                $varTotal[]=$v;

            }

        }

        $varTotal = array_unique($varTotal);  //去掉$varTotal数组中重复的字母

        sort($varTotal);                      //$varTotal数组中字母正向排序

        $varTotal1 = preg_replace("/([A-Z])/","$\\1",$varTotal);  //$varTotal1数组中字母变成变量

        $maxN = count($varTotal);

        //$expressionArr = preg_replace("/([A-Z])/","$\\1",$expressionArr); //$expressionArr数组中字母变成变量

        $newExpression=implode('',$expressionArr); //$expressionArr数组变成字符串

        //echo $newExpression."<br />";

        $newExpression= preg_replace("/([A-Z])->([A-Z])/","!\\1|\\2",$newExpression);

        $newExpression= preg_replace("/(\(.*?\))->([A-Z])/","!\\1|\\2",$newExpression);

        $newExpression= preg_replace("/(\(.*?\))->(.*?)/","!\\1|\\2",$newExpression);

        $newExpression= preg_replace("/([A-Z])->(.*?)/","!\\1|\\2",$newExpression);

        $expressionArr=str_split($newExpression); //将$expression转换成数组

        $expressionArr = preg_replace("/([A-Z])/","$\\1",$expressionArr);

        $newExpression=implode('',$expressionArr);

        //echo $newExpression;

    }

?>

<!DOCTYPE html>

<html>

    <head>

        <meta charset="utf-8" />

        <title>真值表查询1.0    BY:小臻</title>

    </head>

    <body>

    <span style="color:red;text-align:center;"><h1>真值表查询1.0    BY:小臻</h1></span>

    <div style="width:500px;margin:30px auto 0 auto;text-align:center;">

        <form action="" method="get">

            <input type="text" name="TrueTable" value="<?php echo $_GET['TrueTable'] ?>"/>

            <input type="submit" value="确定"/>    <br />    <br />

            <!--<input type="reset" value="取消" /><br /><br />

            <input type="button" value="∨" />

            <input type="button" value="∧" />

            <input type="button" value="┐" />

            <input type="button" value="→" />

            <input type="button" value="↔" /><br /><br />-->

        </form>

        <!--[ 说明：析取(∨) , 合取(∧) , 非(┐) , 蕴含(→) , 等价(↔) ]-->

        <p>[ 说明：析取(|) , 合取(&) , 非(!) , 蕴含(->) , 等价(=) ]</p>

        <table width="300px" style="margin:30px auto 0 auto;text-align:center;border:1px solid #000;">

                <?php

                    echo "<tr>";

                    if(!empty($_GET['TrueTable'])){

                        foreach($varTotal as $v){

                            echo "<td>{$v}</td>";

                        }

                        echo "<td>结果</td>";

                        $result=pow(2,$maxN);

                        for($i=0;$i<$result;$i++){

                            $resultN[$i]=sprintf("%0{$maxN}d",decbin($i));

                            $resultN[$i]=str_split($resultN[$i]);

                        }

                        foreach($resultN as $k=>$v){

                            echo "<tr>";

                            foreach($resultN[$k] as $k1=>$v1){

                                echo "<td>".$v1."</td>";

                                $varTotal2[$k1]=$varTotal1[$k1]."=".$v1;

                                //echo $varTotal2[$k1]." ";

                                eval($varTotal2[$k1].";");

                            }

                            //echo $newExpression;

                            eval("\$varTotal3[] = ".$newExpression.";");

                            foreach($varTotal3 as $k2=>$v){

                                if($v==NULL){

                                    $varTotal3[$k2]=0;

                                }

                            }

                            echo "<td>".$varTotal3[$k]."</td>";

                            echo "</tr>";

                        }

                        //print_r($varTotal3);

                    }

                ?>

        </table>

    </div>

    </body>

</html>

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