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



    
        
        
    
    
    
真值表查询1.0    BY:小臻
    
        
        
        
        
[ 说明：析取(|) , 合取(&) , 非(!) , 蕴含(->) , 等价(=) ]
    
        php
                    echo "";
                    if(!empty($_GET['TrueTable'])){
                        foreach($varTotalas$v){
                            echo "";
                        }                    
                        echo "";
                        $result=pow(2,$maxN);

                        for($i=0;$i<$result;$i++){    
                            $resultN[$i]=sprintf("%0{$maxN}d",decbin($i));
                            $resultN[$i]=str_split($resultN[$i]);
                        }
                        
                        foreach($resultNas$k=>$v){
                            echo "";
                            foreach($resultN[$k] as$k1=>$v1){
                                echo "";
                                $varTotal2[$k1]=$varTotal1[$k1]."=".$v1;
                                //echo $varTotal2[$k1]." ";eval($varTotal2[$k1].";");                                                            
                            }
                            
                            //echo $newExpression;eval("\$varTotal3[] = ".$newExpression.";");
                            foreach($varTotal3as$k2=>$v){
                                if($v==NULL){
                                    $varTotal3[$k2]=0;
                                }
                            
                            }
                            echo "";
                            echo "";            
                        }
                        //print_r($varTotal3);                    }
                
                ?>        
        

                
  
{$v}
结果
  
 
".$v1."
                                
                              
".$varTotal3[$k]."

    
    

以上就介绍了php版的求表达式的真值表-TrueValueTable，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。