Question

我有一个名为test_config的数据库表，有2个列，名为＆amp;值。我想遍历每一行并从名称和值创建$variables，例如$Name = "Value";，然后可以在php文件中使用。第一行在Name colum中有abc，在value columb中有123，因此创建的vaiable将是$abc = 123;

可以这样做。

感谢。

Answer 1

这就是方法，但没有命名变量

$arr = array();
while($row = $query->fetch_array()){
    $arr['name'=>$row['name'], 'value'=>$row['value']];
}

Answer 2

我读到你想为每个名字创建一个变量。如果我是你，我会把它放在一个阵列中，就像Jeroen说的那样。这可以通过执行以下操作来实现：

#include <iostream>
#include <string>

using namespace std;

struct Point {
private:
    int xCord,yCord;

public:
    void setX(int x);
    void setY(int y);
    int getX();
    int getY();
    int rotate(int x, int y, Point p1);
    int moveHorizontally(int x, int a, int b);
    int moveVertically(int y, int a, int b);    
};

int main() {
    Point p1;

    p1.setX(1);     //sets X
    p1.setY(2);     //sets Y

    cout << p1.getX() << ", " << p1.getY() << endl;  //prints current value of X & Y 

    p1.rotate(p1.getX(), p1.getY(), p1);
    cout << p1.getX() << ", " << p1.getY() << endl; 

    return 0;
}

void Point::setX(int newX) {
    xCord = newX;
}

void Point::setY(int newY) {
    yCord = newY;
}

int Point::getY() {       //This will just return the y Cord.
    return yCord;
}

int Point::getX() {      //This will just return the x Cord.
    return xCord;
}

int Point::moveHorizontally(int x, int tempX, int tempY) {
    //Move the point to the right if positive.
    //Move the point to the left if negative.
    int newX = tempX + (x);
    return newX;
}

int Point::moveVertically(int y, int tempX, int tempY) {
    //Move the point up if positive.
    //Move the point down if negative.
    int newY = tempY + (y);
    return newY;
}

int Point::rotate(int tempX, int tempY, Point p1){  
    //(1,2) -->> (-2,1)
    int tempX_DNC = tempX;
    int tempY_DNC = tempY;
    int quadrant;

    if((tempX > 0) && (tempY > 0)) {     //Quadrant 1: x(positive), y(positive)  Then rotates to Quad 2
        quadrant = 1;
        tempX = -(tempY);
        tempY = tempX_DNC;
    } else if ((tempX < 0) && (tempY > 0)) {      //Quadrant 2: x(negative), y(positive)  Then rotates to Quad 3
        quadrant = 2;
        tempX = -(tempY_DNC);
        tempY = tempX_DNC;
    } else if ((tempX < 0) && (tempY < 0)) {     //Quadrant 3: x(negative), y(negative)   Then rotates to Quad 4
        quadrant = 3;
        tempX = -(tempY_DNC);
        tempY = tempX_DNC;
    } else if ((tempX > 0) && (tempY < 0)) {     //Quadrant 4: x(positive), y(negative)  Then rotates to Quad 1
        quadrant = 4;
        tempX = -(tempY_DNC);
        tempY = tempX_DNC; 
    } else {
        quadrant = 0;
    }

    //This will rotate the points 90* to the left.
    //(1,2) will then become (-2,1)
    //I could have if in quadrant1, all are positive, if in quadrant 2 the x would be negative and y would be positive
    //If in quadrant 3 the x and y will both be negative, if in quadrant 4 the x would be positive and the y would be negative
    cout << tempX << ", " << tempY << endl;
    p1.setX(tempX);
    p1.setY(tempY);
    cout <<"x is: " <<p1.getX() <<endl;
    cout <<"Y is: " <<p1.getY() <<endl;
}

Answer 3

假设您有来自数据库的数组 -

$foo = array('first' =>  '1st',
             'second' => '2nd',
             'third' =>  '3rd');

您希望输出为 -

$first = '1st';
$second = '2nd';
$third = '3rd';

您可以使用extract()功能

<?php extract($foo); ?>

http://ua.php.net/extract

参考 - Create new variables from array keys in PHP

Answer 4

在迭代数据库行的循环中，您可以使用extract（）将列设置为变量及其值。

while ($databaseROW = mysql_fetch_assoc($result))
{
    extract($databaseROW);

    //rest of code from here down can now use variables
    //you have columns Name & Value 
    //so now $Name & $Value variables are available
    //$Name = "value from column Name for this $databaseROW";
    //$Value = "value from column Value for this $databaseROW";

}

Answer 5

通过一些进一步的研究，我找到了解决方案。


try {
    $conn = new PDO("mysql:host=".DB_HOST.";dbname=".DB_NAME."", DB_USERNAME, DB_PASSWORD);
    // set the PDO error mode to exception
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 
    $stmt = $conn->prepare("SELECT Name, Value FROM test_config");
    $stmt->setFetchMode(PDO::FETCH_KEY_PAIR);
    $stmt->execute(); 
    $array = $stmt->fetchAll();
    //var_dump($array);
    extract($array);
    }
catch(PDOException $e)
    {
    echo "Connection failed: " . $e->getMessage();
    }
$conn = null;

然后我用

测试它

echo "The first row variable  is $abc</br>";

来自数据库的php变量

5 个答案: