Passing variable between PHP functions

Question

I have the following function:

class TariffFareController {

public static function checkRunin($fieldPickup) {

    $runInThreshold = 5;
    $fieldDestination = 6;

    if ($fieldPickup > $runInThreshold && $fieldDestination > $runInThreshold)

    {

        if ($fieldPickup > $fieldDestination)

        {

            $distance = $fieldPickup - $runInThreshold;

        } else {

            $distance = $fieldDestination - $runInThreshold;

        }


       }
}

I want to pass $distance to this function:-

private static function getFare($int_terminate) {

    //CODE
    //eg// if($distance > 5) {

        //do something

    }

}

How can I do this?

What do you mean by you want to "pass $distance"? Will you be calling getFare from within checkRunin? — Bafsky
– Bafsky, Commented Mar 15, 2013 at 14:02
I want to use $distance in the getFare function, so I can do something like if($distance > 5) { //DO SOMETHING } — nsilva
– nsilva, Commented Mar 15, 2013 at 14:20
@nsilva can you not declare $distance as a static variable and set it and access it as so from each of your methods? — Nicholas King
– Nicholas King, Commented Mar 18, 2013 at 10:03
Ahh that's easy... Are you accessing these via any instance or static methods? — Keval Domadia
– Keval Domadia, Commented Mar 18, 2013 at 10:09

John Conde · Accepted Answer · 2013-03-15 14:01:59Z

5

return the value from the first function:

public static function checkRunin($fieldPickup) {
    $runInThreshold = 5;
    $fieldDestination = 6;

    if ($fieldPickup > $runInThreshold && $fieldDestination > $runInThreshold)
    {
        if ($fieldPickup > $fieldDestination)
        {
            $distance = $fieldPickup - $runInThreshold;
        } else {
            $distance = $fieldDestination - $runInThreshold;
        }
    }
    return $distance;
}

// Get $distance from checkRunin()
$distance = $obj->checkRunin($fieldPickup);
// Pass $distance as a parameter
$obj->getFare($distance);

answered Mar 15, 2013 at 14:01

John Conde

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1 Comment

sh03 Over a year ago

Return the variable $distance in the first function only if it makes sense for that function to do that. checkRunin doesn't seems so obvious it will return some kind of a distance to me.

Baba · Accepted Answer · 2013-03-18 16:06:29Z

When you say its does not work ... it basically because $diffrent was not properly declared so you are having scope issues

My Assumption

Both checkRunin and getFare are method of the same class TariffFareController
$int_terminate is different from $distance

From your class

$distance not declared as static
getFare is trying to access $distance that has not been declared

Simple Solution

class TariffFareController {
    private static $distance = 0;

    public static function checkRunin($fieldPickup) {
        $runInThreshold = 5;
        $fieldDestination = 6;
        if ($fieldPickup > $runInThreshold && $fieldDestination > $runInThreshold) {
            if ($fieldPickup > $fieldDestination) {
                self::$distance = $fieldPickup - $runInThreshold;
            } else {
                self::$distance = $fieldDestination - $runInThreshold;
            }
        }
        printf("self:\$distance = %d ; // Called %s :\n", self::$distance, __METHOD__);
    }

    public static function getFare($int_terminate) {
        printf("self:\$distance = %d ; // Called %s :\n", self::$distance, __METHOD__);
    }
}

TariffFareController::checkRunin(10);
TariffFareController::getFare(2);

Output

self:$distance = 5 ; // Called TariffFareController::checkRunin :
self:$distance = 5 ; // Called TariffFareController::getFare :

Nicholas King · Accepted Answer · 2013-03-18 10:06:29Z

1

class TariffFareController {

public static $distance = 0;
public static function checkRunin($fieldPickup) {

$runInThreshold = 5;
$fieldDestination = 6;

if ($fieldPickup > $runInThreshold && $fieldDestination > $runInThreshold)

{

    if ($fieldPickup > $fieldDestination)

    {

        self::$distance = $fieldPickup - $runInThreshold;

    } else {

        self::$distance = $fieldDestination - $runInThreshold;

    }


   }
}

then

private static function getFare($int_terminate) {

//CODE
//eg// if(self::$distance > 5) {

    //do something

}

}

answered Mar 18, 2013 at 10:06

Nicholas King

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7 Comments

nsilva Over a year ago

That's great thank you. However, in some of the other functions I now have an error because I am returning the fare as follows return self::getFare(0); and so it is expecting the parameter $fieldPickup. What would I have to change this to? - do apologise, i'm fairly new to PHP

Nicholas King Over a year ago

sorry could you please elaborate on the problem, I'm not sure I follow. you have two static methods checkRunin($fieldPickup), and getFare($int_terminate) what in getFare is expecting $fieldPickup?

Nicholas King Over a year ago

Also as a matter of note, i'm not sure if creating all these methods and parameters as static is the best way of trying to do what it seems like you are trying to do. Although I understand that we dont get the whole scope of the problem and solution on stackoverflow. Thanks

nsilva Over a year ago

sorry ignore the bit above. I've done as you have said, if I echo(self::$runindistance) I get the value within the checkRunin function, however, if I echo(self::$runindistance) within the getFare function, the variable is null. Any ideaS?

Nicholas King Over a year ago

$runindistance is declared where and how? have you substituted distance for $runindistance?

|

csw · Accepted Answer · 2013-03-21 16:19:33Z

0

public static function checkRunin($fieldPickup) {
$runInThreshold = 5;
$fieldDestination = 6;

if ($fieldPickup > $runInThreshold && $fieldDestination > $runInThreshold)
{
    if ($fieldPickup > $fieldDestination)
    {
        $distance = $fieldPickup - $runInThreshold;
    } else {
        $distance = $fieldDestination - $runInThreshold;
    }
}
return $distance;

}

// Get $distance from checkRunin()
$distance = $obj::checkRunin($fieldPickup);
// Pass $distance as a parameter
$obj::getFare($distance);

that is the answer from @John Conde
just don't forget the static scope use ::

answered Mar 21, 2013 at 16:19

csw

1257 bronze badges

Comments

user2193789 · Accepted Answer · 2013-03-22 05:25:19Z

0

I dont know why the answer above didnt work for you. But try this idea
class someThing { protected $distance; protected function initDistance() { $this->distance = 5; } protected function useDistance(){ if($this->distance < 5) { //do anything } } $obj = new someThing(); $obj->initDistance(); $obj->useDistance();

answered Mar 22, 2013 at 5:25

user2193789

Comments

nsilva · Accepted Answer · 2013-03-18 15:58:21Z

-1

Would it not be possible to use sessions as follows:-

session_start();

public static function checkRunin($fieldPickup) {

    $runInThreshold = 5;
    $fieldDestination = 6;
    $_SESSION['runin_distance'] = 0;

    if ($fieldPickup > $runInThreshold && $fieldDestination > $runInThreshold) {

        if ($fieldPickup > $fieldDestination) {

            $_SESSION['runin_distance'] = $fieldPickup - $runInThreshold;


        } else {

            $_SESSION['runin_distance'] = $fieldDestination - $runInThreshold;

        }

    }

}

and then...

private static function getFare($int_terminate) {

    if($_SESSION['runin_distance'] > 5) {

    //do something

    }

}

edited Mar 18, 2013 at 15:58

answered Mar 18, 2013 at 14:49

nsilva

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Comments

carz · Accepted Answer · 2013-03-15 14:03:02Z

-3

create distance as a global variable, set it when in checkRunIn, then access it when you need it in getFare

answered Mar 15, 2013 at 14:03

carz

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