Question

我试图将一个变量传递给一个函数，在该函数中声明它的值，然后根据第一个函数中声明的值在第二个函数中使用它。目前，下面的代码只是输出“空”＆＃39;没有别的。任何人都能帮我解决我出错的地方吗？

<?php

global $mtcurrentLoc;

function displayCurrentLoc() {

// Set the current date variable.
$currentDate = time();

// If the current date is greater than the 19th of October and less than the 1st November at 4PM, then print the corresponding address.
if ($currentDate > strtotime('2014-10-19 00:00:00') && $currentDate < strtotime('2014-11-01 16:00:00')) {
    print "3 Mills Studio
                    <br/>Three Mill Lane
                    <br/>London
                    <br/>England
                    <br/>E3 3DU";
    // Set the current location as a global variable for use in displayMilesTravelled function.
    global $mtcurrentLoc;
    $mtcurrentLoc = "London";
}

}

function displayMilesTravelled() {
global $mtcurrentLoc;
switch ($mtcurrentLoc) {
    case "London":
        print "244 Miles";
        break;
    case "Plymouth":
        print "488 Miles";
        break;
    case "Glasgow":
        print "970 Miles";
        break;
    case "Salford":
        print "1,185 Miles";
        break;
    case "London2":
        print "1,400 Miles";
        break;
    case "Surrey":
        print "1,435 Miles";
        break;
    case "Nottingham":
        print "1,576 Miles";
        break;
    case "Liverpool":
        print "1,690 Miles";
        break;
    case "Norwich":
        print "1,942 Miles";
        break;
    case "Birmingham":
        print "2,102 Miles";
        break;
    case "Milton Keynes":
        print "2,173 Miles";
        break;
    case "Bradford":
        print "2,328 Miles";
        break;
    case "Southampton":
        print "2,578 Miles";
        break;
    case "Wales":
        print "2,716 Miles";
        break;
}
}

?>

<p><?php print var_dump(displayMilesTravelled()); ?></p>

Answer 1

为什么不使用对象？

<?php

class miles
{

    public $mtcurrentLoc;
    public $address;

    function __construct()
    {
        // Set the current date variable.
        $this->currentDate = time();
    }

    function setAddress()
    {
        // If the current date is greater than the 19th of October and less than the 1st November at 4PM, then print the corresponding address.
        if ($this->currentDate > strtotime('2014-10-19 00:00:00') && $this->currentDate < strtotime('2014-11-01 16:00:00')) {
            $this->address = "
            3 Mills Studio<br/>
            Three Mill Lane<br/>
            London<br/>
            England<br/>
            E3 3DU";
            // Set the current location as a global variable for use in displayMilesTravelled function.
            $this->mtcurrentLoc = "London";
        }
    }

    function displayMilesTravelled() {

        $this->setAddress();

        switch ($this->mtcurrentLoc) {
            case "London":
                $this->address.= "<br>244 Miles";
                break;
            case "Plymouth":
                $this->address.= "<br>488 Miles";
                break;
            case "Glasgow":
                $this->address.= "<br>970 Miles";
                break;
            case "Salford":
                $this->address.= "<br>1,185 Miles";
                break;
            case "London2":
                $this->address.= "<br>1,400 Miles";
                break;
            case "Surrey":
                $this->address.= "<br>1,435 Miles";
                break;
            case "Nottingham":
                $this->address.= "<br>1,576 Miles";
                break;
            case "Liverpool":
                $this->address.= "<br>1,690 Miles";
                break;
            case "Norwich":
                $this->address.= "<br>1,942 Miles";
                break;
            case "Birmingham":
                $this->address.= "<br>2,102 Miles";
                break;
            case "Milton Keynes":
                $this->address.= "<br>2,173 Miles";
                break;
            case "Bradford":
                $this->address.= "<br>2,328 Miles";
                break;
            case "Southampton":
                $this->address.= "<br>2,578 Miles";
                break;
            case "Wales":
                $this->address.= "<br>2,716 Miles";
                break;
        }

        return $this->address;
    }

}
$miles = new miles();

echo '<p>'.$miles->displayMilesTravelled().'</p>';

//or if you need a function then do something like

function displayMilesTravelled(){
    global $miles;
    return $miles->displayMilesTravelled();
}
?>

<p><?php echo displayMilesTravelled(); ?></p>

单独函数内的PHP全局变量

1 个答案: