PHP version of truth table for expressions-TrueValueTable, truth table logical expression_PHP tutorial

PHP version of truth table for expressions-TrueValueTable, truth table logical expression

php error_reporting(E_ALL & ~E_NOTICE); $expression=$_GET['TrueTable']; //Read input box data if(!empty($_GET['TrueTable'])){ $expression=strtoupper($expression); //Replace the entered lowercase letters with uppercase letters Letter $expressionArr=str_split($expression); //Convert $expression into array foreach($expressionArr as $v){ //Put letters in $varTotal in array if($v>='A' && $v<='Z'){ $varTotal[]=$v; } } $varTotal = array_unique($varTotal); //Remove repeated letters in the $varTotal array sort($varTotal); //Forward sorting of letters in the $varTotal array $varTotal1 = preg_replace("/([A-Z])/","$\1",$varTotal); //The letters in the $varTotal1 array become variables $maxN = count($varTotal); //$expressionArr = preg_replace("/([A-Z])/","$\1",$expressionArr); //The letters in the $expressionArr array become variables $newExpression=implode('',$expressionArr); //$expressionArr array becomes a string //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); //Convert $expression into array $expressionArr = preg_replace("/([A-Z])/","$\1",$expressionArr); $newExpression=implode('',$expressionArr); //echo $newExpression; } ?> $_GET['TrueTable'] ?>"/>

[Explanation: disjunction (|), conjunction (&), non-(!), implication (->), equivalence (=) ]

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]."

http://www.bkjia.com/PHPjc/963545.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/963545.htmlTechArticlephp版的求表达式的真值表-TrueValueTable，真值表逻辑表达式 ? php error_reporting ( E_ALL ~ E_NOTICE ); $expression = $_GET ['TrueTable']; // 读取输入框数据...